Test - Unit Eight Electricity and Magnestism

Question 1

Charge can act at a distance by exerting a(n) electric field, which is an example of _____.

Answer 1

Induction

U8C1 - Charge p. 3 & 4

Question 2

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

Answer 2

• movement of clouds causes a build up of static electricity
• when e- build up enough it induces a positive charge on Earth
• attraction becomes so great that e- got to Earth to neutralize
• it’s a static discharge transfer

Unit Eight - Electricity and Magnetism Test Key

Question 3

Explain how a battery works.

Answer 3

• chemical energy —> voltage difference between positive and negative terminals
• when connected, this pushes current through wire due to voltage difference
• e- flow from positive end to negative end

Unit Eight - Electricity and Magnetism Test Key

Question 4

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

Answer 4

When nonmagnetic objects are placed in a strong enough magnetic field and become magnetized due to poles within their atoms aligning (all e- oriented in the same direction).

Question 5

The force or push that causes electric charges to move is called.

Answer 5

Voltage difference

U8C2 - Current p. 7

Question 6

The Law of Conservation of Charge states that _____.

Answer 6

charge cannot be created and destroyed but it can be transferred.

U8C1 - Charge p. 3

Question 7

What process is the method by which a neutral object obtains an electrical charge from a distance?

Answer 7

Induction

U8C1 - Charge p. 4