Electromagnets quiz

Electromagnets quiz DEFAULT

Mini-Quiz: Electromagnets

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by Ron Kurtus (revised 31 December 2012)

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Electromagnets

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When an electric current flows through a wire, a magnetic field can be produced. When electricity creates a magnetic field, it is called electromagnetism. ​An electromagnet is considered a temporary magnet because if the current of electricity stops its flow, there will no longer be a magnetic field. The magnetic field of a temporary magnet can be turned on and off by using a switch. The size of an electromagnet’s magnetic field and magnetism is not the same. There are several variables involved that affect the magnetic field and its strength. The variables include the amount of voltage used, size of the core, the number of wire coils, the number of turns of the wire coil, and the space between the wire coils as they are wrapped around the core.

 

 

 

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  1. magnet01.gifWhich can be picked up by a magnet? [8j-1]
    1.   iron nail
    2.   aluminium can
    3.   plastic comb
    4.   graphite rod
  2. magnet01.gifWhich can be picked up by a magnet? [8j-2]
    1.   copper nail
    2.   nickel plate
    3.   paper boat
    4.   wooden rod
  3. magnet01.gifWhich can be picked up by a magnet? [8j-3]
    1.   brass door handle
    2.   aluminium can
    3.   steel paper clip
    4.   ceramic bowl
  4. magnet01.gifWhich can be picked up by a magnet? [8j-4]
    1.   pewter mug
    2.   aluminium screw
    3.   plastic fork
    4.   tinned steel can
  5. magnet01.gifWhich can be picked up by a magnet? [8j-5]
    1.   cobalt plate
    2.   aluminium screw
    3.   plastic fork
    4.   pewter mug
  6. magnet01.gifWhich of the following is TRUE? [8j-6]
    1.   if object x is attacted by a magnet, x must be a magnet
    2.   unlike poles attract
    3.   like poles have no effect on each other
    4.   if object x is repelled by a magnet, x cannot be a magnet
  7. magnet01.gifWhich of the following is TRUE? [8j-7]
    1.   if object x is attacted by a magnet, x must be a magnet
    2.   magnetic forces cannot act through non-magnetic materials
    3.   like poles repel
    4.   if object x is repelled by a magnet, x cannot be a magnet
  8. magnet01.gifWhich of the following is TRUE? [8j-8]
    1.   if object x is attacted by a magnet, x must be a magnet
    2.   magnetic forces cannot act through non-magnetic materials
    3.   like poles have no effect on each other
    4.   if object x is repelled by a magnet, x must be a magnet
  9. magnet01.gifWhich of the following is TRUE? [8j-9]
    1.   if object x is attacted by a magnet, x may be a magnet
    2.   magnetic forces cannot act through non-magnetic materials
    3.   like poles have no effect on each other
    4.   if object x is repelled by a magnet, x cannot be a magnet
  10. magnet01.gifWhich of the following is TRUE? [8j-10]
    1.   if object x is attacted by a magnet, x must be a magnet
    2.   magnetic forces can act through non-magnetic materials
    3.   unlike poles have no effect on each other
    4.   if object x is repelled by a magnet, x cannot be a magnet
  11. magnet01.gifWhich of the following is TRUE? [8j-11]
    1.   if object x is attacted by a magnet, x must be a magnet
    2.   unlike poles have no effect on each other
    3.   magnetic forces cannot act through magnetic materials
    4.   if object x is repelled by a magnet, x cannot be a magnet
  12. magnet01.gifWhich of the following is TRUE? [8j-12]
    1.   if object x is attacted by a magnet, x must be a magnet
    2.   magnetic forces cannot act through non-magnetic materials
    3.   magnetic forces can act through magnetic materials
    4.   magnetic materials can be made into a magnet by stroking with the pole of a magnet
  13. magnet01.gifWhich of the following is TRUE? [8j-13]
    1.   a freely moving magnet comes to rest pointing in a north-south direction
    2.   magnetic forces cannot act through non-magnetic materials
    3.   magnetic forces can act through magnetic materials
    4.   the Earth's geographic north pole is actually the north pole of the Earth's magnetic field
  14. magnet01.gifWhich of the following is TRUE? [8j-14]
    1.   a freely moving magnet comes to rest pointing in an east-west direction
    2.   the Earth's geographic north pole is actually the south pole of the Earth's magnetic field
    3.   magnetic forces can act through magnetic materials
    4.   unlike poles have no effect on each other
  15. magnet01.gifWhich of the following is TRUE? [8j-15]
    1.   the magnetic field of a bar magnet goes from the south pole to the north pole
    2.   the Earth's geographic north pole is actually the north pole of the Earth's magnetic field
    3.   if two pieces of metal repel each other, they are both a magnet
    4.   unlike poles have no effect on each other
  16. magnet01.gifWhich of the following is TRUE? [8j-16]
    1.   a freely moving magnet comes to rest pointing in an east-west direction
    2.   the Earth's geographic south pole is actually the south pole of the Earth's magnetic field
    3.   if two pieces of metal repel each other, neither can be a magnet
    4.   the magnetic field of a bar magnet goes from the north pole to the south pole
  17. circuitbreaker.gifThe sketch on the left shows the design of a simple circuit breaker. These are safety switches which 'break' the circuit if the current becomes too large. What useful effect does the coil produce? [8j-17]
    1.   magnetic force field
    2.   electrical force field
    3.   gravitational force field
    4.   nuclear force field
  18. circuitbreaker.gifThe sketch on the left shows the design of a simple circuit breaker. These are safety switches which 'break' the circuit if the current becomes too large. To make the magnetic field effect of the coil stronger what should the core be made of?? [8j-18]
    1.   hard steel
    2.   soft iron
    3.   malleable copper
    4.   alloyed aluminium
  19. circuitbreaker.gifThe sketch on the left shows the design of a simple circuit breaker. These are safety switches which 'break' the circuit if the current becomes too large. What is the purpose of the soft iron core? [8j-19]
    1.   to hold the coil in place
    2.   to ensure it is a good electrical conductor
    3.   to concentrate the magnetic field produced
    4.   to allow efficient conduction of heat to keep the switch cool at higher currents
  20. circuitbreaker.gifThe sketch on the left shows the design of a simple circuit breaker. These are safety switches which 'break' the circuit if the current becomes too large. What should the coil surrounding the core be made of? [8j-20]
    1.   steel wire
    2.   insulated steel wire
    3.   bare copper wire
    4.   insulated copper wire
  21. circuitbreaker.gifThe sketch on the left shows the design of a simple circuit breaker. These are safety switches which 'break' the circuit if the current becomes too large. Which are the best combination of reasons why the rocker should be made of iron? [8j-21]
    1.   its strong, magnetic and a good electrical conductor
    2.   its strong, high melting and a good conductor of heat
    3.   its high melting, strong but flexible and a good electrical conductor
    4.   its strong, magnetic and won't corrode easily
  22. circuitbreaker.gifThe sketch on the left shows the design of a simple circuit breaker. These are safety switches which 'break' the circuit if the current becomes too large. What is the purpose of the 'springy piece of steel? [8j-22]
    1.   to keep the electrical circuit complete
    2.   to ensure the contacts stay together
    3.   to spring back the contacts on current overload
    4.   to act as a switch control
  23. circuitbreaker.gifThe sketch on the left shows the design of a simple circuit breaker. These are safety switches which 'break' the circuit if the current becomes too large. What happens if there is an unsafe increase in current? [8j-23]
    1.   the rocker heats up and bends away from the upper contact breaking the circuit
    2.   the end of the rocker melts breaking the circuit
    3.   the magnetic field increases sufficiently for the soft iron core to attract the rocker breaking the circuit
    4.   the spring breaks allowing the contacts to move apart breaking the circuit
  24. circuitbreaker.gifThe sketch on the left shows the design of a simple circuit breaker. These are safety switches which 'break' the circuit if the current becomes too large. How can the strength of the magnetic field of the coil be increased without change in the current? [8j-24]
    1.   make the radius of the coils larger
    2.   make the core longer
    3.   use thinner wire
    4.   add more coils of wire around the core
  25. magnet01.gif Which of the following is TRUE? [8j-25]
    1.   soft iron makes a good temporary magnet
    2.   steel makes a poor permanent magnet
    3.   iron is a poor magnetic shield
    4.   copper is a good magnetic shield
  26. magnet01.gif Which of the following is TRUE? [8j-26]
    1.   soft iron makes a poor temporary magnet
    2.   steel makes a good permanent magnet
    3.   iron is a poor magnetic shield
    4.   copper is a good magnetic shield
  27. magnet01.gif Which of the following is TRUE? [8j-27]
    1.   soft iron makes a good permanent magnet
    2.   steel makes a good temporary magnet
    3.   iron is a good magnetic shield
    4.   copper is a good magnetic shield
  28. magnet01.gif Which of the following is TRUE? [8j-28]
    1.   soft iron makes a good permanent magnet
    2.   steel makes a good temporary magnet
    3.   iron is a poor magnetic shield
    4.   copper is a poor magnetic shield
  29. magnet01.gif Which of the following is TRUE? [8j-29]
    1.   steel is a good magnetic shield
    2.   iron in contact with a magnet cannot become a magnet
    3.   aluminium is a good magnetic shield
    4.   only iron, and not steel, can be magnetised inside wire coils of an electric circuit
  30. magnet01.gif Which of the following is TRUE? [8j-30]
    1.   steel is a poor magnetic shield
    2.   iron in contact with a magnet becomes a magnet
    3.   aluminium is a good magnetic shield
    4.   only iron, and not steel, can be magnetised inside wire coils of an electric circuit
  31. magnet01.gif Which of the following is TRUE? [8j-31]
    1.   steel is a poor magnetic shield
    2.   iron in contact with a magnet cannot become a magnet
    3.   aluminium is a poor magnetic shield
    4.   only iron, and not steel, can be magnetised inside wire coils of an electric circuit
  32. magnet01.gif Which of the following is TRUE? [8j-32]
    1.   steel is a poor magnetic shield
    2.   iron in contact with a magnet cannot become a magnet
    3.   aluminium is a good magnetic shield
    4.   both iron and steel can be magnetised inside wire coils of an electric circuit
    1.   NOTHING
    2.   REPEL
    3.   ATTRACT
    1.   NOTHING
    2.   REPEL
    3.   ATTRACT
    1.   NOTHING
    2.   REPEL
    3.   ATTRACT
    1.   NOTHING
    2.   REPEL
    3.   ATTRACT
    1.   NOTHING
    2.   REPEL
    3.   ATTRACT
    1.   NOTHING
    2.   REPEL
    3.   ATTRACT
    1.   THEY VIBRATE
    2.   THEY DO NOTHING
    3.   THEY ATTRACT
    4.   THEY REPEL
    1.   THEY VIBRATE
    2.   THEY DO NOTHING
    3.   THEY REPEL
    4.   THEY ATTRACT
    1.   when current switched ON the two rods repel in coil 3
    2.   when current switched OFF nothing happens to the rods in coil 3
    3.   when current switched ON nothing happens to the rods in coil 5
    4.   when current switched ON the two rods attract in coil 4
    1.   when current switched ON nothing happens to the rods in coil 3
    2.   when current switched OFF the two rods roll back in coil 3
    3.   when current switched ON nothing happens to the rods in coil 5
    4.   when current switched ON the two rods attract in coil 4
    1.   when current switched ON nothing happens to the rods in coil 3
    2.   when current switched OFF nothing happens to the rods in coil 3
    3.   when current switched ON the two rods repel in coil 5
    4.   when current switched ON the two rods attract in coil 4
    1.   when current switched ON nothing happens to the rods in coil 3
    2.   when current switched OFF nothing happens to the rods in coil 3
    3.   when current switched ON nothing happens to the rods in coil 5
    4.   when current switched ON nothing happens to the two rods in coil 4
    1.   when current switched OFF the rods stay apart in coil 5
    2.   when current switched OFF nothing happens to the rods in coil 3
    3.   when current switched ON nothing happens to the rods in coil 5
    4.   when current switched ON the two rods attract in coil 4
    1.   there is no magnetic field outside coil 2
    2.   there is a magnetic field produced in coil 1
    3.   the iron rod weakens the magnetic field in coil 2
    4.   there is a much stronger magnetic field produced in coil 1
    1.   there is no magnetic field outside coil 2
    2.   there is no magnetic field produced in coil 1
    3.   the iron rod strengthens the magnetic field in coil 2
    4.   there is a much stronger magnetic field produced in coil 1
    1.   there is no magnetic field outside coil 2
    2.   there is no magnetic field produced in coil 1
    3.   the iron rod weakens the magnetic field in coil 2
    4.   there is a much stronger magnetic field produced in coil 2
  33. mag7.gifYou are shown the direction a compass would point on the left hand side of the north pole. From your knowledge of the magnetic field pattern of a bar magnet predict the compass bearing for the magnetic field position 1? [8j-49]
    1.   comp3.gif
    2.   comp4.gif
    3.   comp7.gif
    4.   comp5.gif
    5.   comp8.gif
  34. mag7.gifYou are shown the direction a compass would point on the left hand side of the north pole. From your knowledge of the magnetic field pattern of a bar magnet predict the compass bearing for the magnetic field position 2? [8j-50]
    1.   comp3.gif
    2.   comp4.gif
    3.   comp7.gif
    4.   comp1.gif
    5.   comp8.gif
  35. mag7.gif>You are shown the direction a compass would point on the left hand side of the north pole. From your knowledge of the magnetic field pattern of a bar magnet predict the compass bearing for the magnetic field position 3? [8j-51]
    1.   comp3.gif
    2.   comp4.gif
    3.   comp7.gif
    4.   comp5.gif
    5.   comp8.gif
  36. mag7.gifYou are shown the direction a compass would point on the left hand side of the north pole. From your knowledge of the magnetic field pattern of a bar magnet predict the compass bearing for the magnetic field position 4? [8j-52]
    1.   comp3.gif
    2.   comp4.gif
    3.   comp1.gif
    4.   comp7.gif
    5.   comp2.gif
  37. mag7.gifYou are shown the direction a compass would point on the left hand side of the north pole. From your knowledge of the magnetic field pattern of a bar magnet predict the compass bearing for the magnetic field position 5? [8j-53]
    1.   comp7.gif
    2.   comp4.gif
    3.   comp1.gif
    4.   comp5.gif
    5.   comp3.gif
  38. mag7.gifYou are shown the direction a compass would point on the left hand side of the north pole. From your knowledge of the magnetic field pattern of a bar magnet predict the compass bearing for the magnetic field position 2? [8j-54]
    1.   comp7.gif
    2.   comp1.gif
    3.   comp2.gif
    4.   comp8.gif
    5.   comp5.gif
    1.   comp7.gif
    2.   comp1.gif
    3.   comp5.gif
    4.   comp3.gif
    1.   comp7.gif
    2.   comp1.gif
    3.   comp5.gif
    4.   comp3.gif
    1.   comp5.gif
    2.   comp1.gif
    3.   comp7.gif
    4.   comp3.gif
    1.   comp7.gif
    2.   comp1.gif
    3.   comp5.gif
    4.   comp3.gif
    1.   NOTHING
    2.   REPEL each other
    3.   ATTRACT each other
    4.   start to VIBRATE
    1.   NOTHING
    2.   REPEL each other
    3.   ATTRACT each other
    4.   start to VIBRATE
    1.   REPEL each other
    2.   NOTHING
    3.   ATTRACT each other
    4.   start to VIBRATE
    1.   start to VIBRATE
    2.   REPEL each other
    3.   ATTRACT each other
    4.   NOTHING
  39. compexpts1.gif
    Some students tried to predict the patterns plotting compass needles would make with various arrangements. Starting with two compasses placed apart or together, they then considered three compasses in a triangle or four compasses forming a square. From their sketches, and remembering that a plotting compass is a tiny magnet, which is probably a correct expt. arrangement? [8j-63]
    1.   arrangement in expt. 1
    2.   arrangement in expt. 7
    3.   arrangement in expt. 11
    4.   arrangement in expt. 13
  40. compexpts1.gif
    Some students tried to predict the patterns plotting compass needles would make with various arrangements. Starting with two compasses placed apart or together, they then considered three compasses in a triangle or four compasses forming a square. From their sketches, and remembering that a plotting compass is a tiny magnet, which is probably a correct expt. arrangement? [8j-64]
    1.   arrangement in expt. 3
    2.   arrangement in expt. 5
    3.   arrangement in expt. 10
    4.   arrangement in expt. 12
  41. compexpts1.gif
    Some students tried to predict the patterns plotting compass needles would make with various arrangements. Starting with two compasses placed apart or together, they then considered three compasses in a triangle or four compasses forming a square. From their sketches, and remembering that a plotting compass is a tiny magnet, which is probably a correct expt. arrangement? [8j-65]
    1.   arrangement in expt. 4
    2.   arrangement in expt. 6
    3.   arrangement in expt. 8
    4.   arrangement in expt. 15
  42. compexpts1.gif
    Some students tried to predict the patterns plotting compass needles would make with various arrangements. Starting with two compasses placed apart or together, they then considered three compasses in a triangle or four compasses forming a square. From their sketches, and remembering that a plotting compass is a tiny magnet, which is probably a correct expt. arrangement? [8j-66]
    1.   arrangement in expt. 4
    2.   arrangement in expt. 17
    3.   arrangement in expt. 12
    4.   arrangement in expt. 9
  43. compexpts1.gif
    Some students tried to predict the patterns plotting compass needles would make with various arrangements. Starting with two compasses placed apart or together, they then considered three compasses in a triangle or four compasses forming a square. From their sketches, and remembering that a plotting compass is a tiny magnet, which is probably a correct expt. arrangement? [8j-67]
    1.   arrangement in expt. 2
    2.   arrangement in expt. 17
    3.   arrangement in expt. 6
    4.   arrangement in expt. 13
  44. compexpts1.gif
    Some students tried to predict the patterns plotting compass needles would make with various arrangements. Starting with two compasses placed apart or together, they then considered three compasses in a triangle or four compasses forming a square. From their sketches, and remembering that a plotting compass is a tiny magnet, which is probably a correct expt. arrangement? [8j-68]
    1.   arrangement in expt. 3
    2.   arrangement in expt. 14
    3.   arrangement in expt. 7
    4.   arrangement in expt. 15
  45. compexpts1.gif
    Some students tried to predict the patterns plotting compass needles would make with various arrangements. Starting with two compasses placed apart or together, they then considered three compasses in a triangle or four compasses forming a square. From their sketches, and remembering that a plotting compass is a tiny magnet, which is probably a correct expt. arrangement? [8j-69]
    1.   arrangement in expt. 3
    2.   arrangement in expt. 6
    3.   arrangement in expt. 16
    4.   arrangement in expt. 11
  46. coil6.gif Two blocks of iron are placed inside a coil through which a current is passed. Which of the following statements is NOT correct? [8j-70]
    1.   the blocks of iron become very slowly magnetised
    2.   the bocks of iron move towards each other
    3.   the poles of the iron blocks will be [N-S] [N-S] or [S-N] [S-N] depending on the direction of current flow
    4.   the iron blocks stay together even after the current is switched off
  47. coil6.gif Two blocks of iron are placed inside a coil through which a current is passed. Which of the following statements is NOT correct? [8j-71]
    1.   the blocks of iron become quickly magnetised
    2.   the bocks of iron repel each other
    3.   the poles of the iron blocks will be [N-S] [N-S] or [S-N] [S-N] depending on the direction of current flow
    4.   the iron blocks stay together even after the current is switched off
  48. coil6.gif Two blocks of iron are placed inside a coil through which a current is passed. Which of the following statements is NOT correct? [8j-72]
    1.   the blocks of iron become quickly magnetised
    2.   the bocks of iron move towards each other
    3.   the poles of the iron blocks will be [N-S] [S-N] or [S-N] [N-S] depending on the direction of current flow
    4.   the iron blocks stay together even after the current is switched off
  49. coil6.gif Two blocks of iron are placed inside a coil through which a current is passed. Which of the following statements is NOT correct? [8j-73]
    1.   the blocks of iron become quickly magnetised
    2.   the bocks of iron move towards each other
    3.   the poles of the iron blocks will be [N-S] [N-S] or [S-N] [S-N] depending on the direction of current flow
    4.   the iron blocks will repel each other after the current is switched off
  50. companim1.gif What material should a compass needle be made of? [8j-74]
    1.   iron
    2.   brass
    3.   aluminium
    4.   steel
Sours: https://docbrown.info/ks3physics/8JmcHP6.htm
Magnetic vortex electromagnet test

Electromagnets 01

This KS3 Science quiz takes a look at electromagnets. When electricity passes through a wire, it creates a weak magnetic field. If the wire is coiled into a spiral shape, the magnetic field from the wire is stronger. If the coil is wrapped round an iron core e.g. a nail, the magnetic field is made even stronger. But it doesn't stop there ... if you increase the current flowing through the coiled wire, the magnetic effect is also increased. Finally, if you add more coils to the spiral, the magnetism can be increased yet again! A coil of wire round an iron core that is connected to a source of electricity is called an electromagnet.

Electromagnets have two big advantages over permanent magnets - they can be switched on and off and they can be made to be very powerful. Three important uses are in electric motors, electric bells and relays.

A relay is a switch that is operated by electricity. It consists of a springy switch contact which is set up to be attracted by an electromagnet. When the electromagnet is switched on or off, the contact arm is attracted and the switch is operated. A relay is a good safety device as a low voltage circuit can be used to operate the electromagnet which then will operate the switch connected to a high voltage circuit. There is therefore no danger of the person operating the electromagnet coming into contact with the high voltage electricity.

Sours: https://www.educationquizzes.com/ks3/science/electromagnets-01/

Quiz electromagnets

It's better than yourself. I repeat his movements. I look at Slavkin pisyun, feel his smell and I have an irresistible desire to taste his taste.

Free Magnetism and Electromagnetism Quiz questions

The flight bird removed the trays. I opened a boring book and tried to read. Victoria looked out the window, but the drunk brandy made itself felt and her head began to bow.

Now discussing:

They perceived Tanya as a hygiene item, something between toilet paper and a terry towel. She was tired of the habit and wanted to ask for a day off. And suddenly, before lunch, Vladimir Petrovich comes to her room with a whole detachment of signalmen and sets two telephones on the table.



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