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Q.

Which of the following is not an electrical insulator? 

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a

Rubber

b

Gold

c

Diamond

d

Glass

answer is A.

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Detailed Solution

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  • Electrical insulators like gold don't exist.
  • Electricity travels well through gold.
  • When voltage is applied, a substance that conducts electrical charge—typically electrons—moves quickly from atom to atom is said to be an electrical conductor.
  • Gold, silver, copper, aluminum, and graphite are excellent conductors of electricity.
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