Test - Unit 8 Electricity and Magnetism

Question 1

43.Explain how lightning is create.Included which type of electric charge transfer it is.

Answer 1

The movement of clouds cause a build up of static electricity.When electrons build up enough it induces a positive charge on earth, eventually the attract pick him so great that electrons go to earth to neutralize it, this is called static discharge

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Question 2

44.Explain how a better works.

Answer 2

A chemical reaction causes a voltage difference between the positive and negative terminals. When connected, this push is current through wire due to voltage different. The electrons flow from the negative into the positive end.

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Question 3

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

Answer 3

When lawn magnetic objects are placed in a strong enough magnetic field and become magnetized to the polls within their items of lining, all the electrons are in the same direction.

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Question 4

Which of the following will increase the resistance of a wire?

Using a shorter wire

Using silver instead of copper

Using a thicker/wider wire

Increasing the temperature of the wire

Answer 4

Increasing the temperature of the wire

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Question 5

Which of the following would increase the strength of the magnetic field around the wire.

Using less loops around the iron core

Using a larger iron core

Flipping the direction of the current flowing through the wire

Increasing the current flowing through the wire

Answer 5

Using less loops around the iron core

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