10
QuizMultiple Choice

Electricity and Magnetism — Test

Question 10 • Physical Science

Cora, an electrician, wraps a copper wire with a thick plastic coating. What is she most likely trying to do?

Answer
A
decrease the wire’s resistance
B
increase the voltage produced by the wire
C
keep the electric potential of the wire balanced
D
keep a current from passing out of the wire

Explanation

Plastic is an electrical insulator, so it resists the movement of electric charge through the coating. Wrapping the copper wire in plastic helps prevent current from escaping the wire and contacting people or other objects. The coating does not decrease the copper wire’s resistance or increase the voltage it produces.

AI-written and checked against the verified answer.

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