Question

Which of the following are conductors and which are insulators ?
Sulphur , Silver , Copper , Cotton , Aluminium , Air , Nichrome , Graphite , Paper , Porcelain , Mercury, Mica , Bakelite , Polythene , Manganin.

Medium

Solution

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The materials, which have free electrons are good conductor of electricity. In general all the metals and their Alloys are good conductors of electricity.

Hence among the given materials, following are conductors:

Graphite is not a metal, but still a conductor of electricity, as it has delocalized(free) electrons, which help in conduction.

Insulators are the materials which do not have free electrons, therefore do not conduct electricity. Following are insulators:

Solve any question of Electric Charges and Fields with:-

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