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Q.

Which of the following is an electric insulator?

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a

Graphite

b

Wood

c

Saltwater

d

Gold

answer is B.

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Detailed Solution

  • An insulator of electricity does not allow electricity to pass through it.
  • Saltwater is a good conductor of electricity as it contains charged particles that can carry electricity therefore, it can't act as an insulator.
  • Graphite and gold are good conductors of electricity.
  • In the given example, wood does not allow electricity to pass through it. Therefore, it is an electric insulator.

 

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Which of the following is an electric insulator?