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Q.

Which of the following materials is a poor conductor of electricity?

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a

Silver

b

Aluminium

c

Iron

d

Glass

answer is C.

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Detailed Solution

  • Metals are good conductors of electricity due to the presence of free electrons. 
  • The electrons that are not bound within the atom and are free to move are called free electrons
  • These free electrons move easily through the metal and allow the metal to conduct an electric current.
  • Silver, iron, and aluminium are metals and have free electrons which help in the conduction of electricity.
  • Glass does not possess free electrons and so cannot conduct electricity. So it is a poor conductor of electricity.
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