Electricity And Magnetism Test Paper

Question 1

42. Charges can act at a distance by exerting a(n) ______ which is an example of charging by _____.

Answer 1

42. Electric field, and induction.

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Question 2

43. Explain how lightning is created. Include which type of electric charge transfer it is.

Answer 2

43. • movement of clouds causes a build up of static electricity.
      
      • when e- build up enough it induces a (+) charge on earth.
      • attraction becomes so great that e- go to earth to neutralize.
        Static discharge

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Question 3

44. Explain how a battery works.

Answer 3

44. Chem. rxn transfers to voltage diff. between (+) and (-) terminals.
    
    • when connected, this pushes current through wire due to voltage diff.
    • e- flow from (-) end to (+) end

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Question 4

51. Explain the two ways we discussed to keep a house from overheating.

Answer 4

51. Fuse = a piece of metal that melts when overheated to open a circuit.
    Circuit breaker = piece of metal that bends when overheated to open the circuit.

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Question 5

52. Describe what an electromagnet is and list the two ways to increase its strength.

Answer 5

52. A temporary magnet made by placing a piece of iron in a current carrying coil of wire.
    More loops, stronger current will strengthen the magnet.

Question 6

53. Explain ferromagnetism. Make sure to include what is happening got the electrons in the atoms you may draw a picture of that helps.

Answer 6

53. When nonmagnetic objects are placed in a strong enough magnetic field and become magnetized due to piles with in their atoms aligning.