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Question

Question 33
Electrical wires have a coating of an insulating material. The material, generally used is
(a) Sulphur
(b) Graphite
(c) PVC
(d) All can be used

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Solution

Option (c) is correct.

Polyvinyl chloride (PVC) is an insulator and is a polymer whereas graphite is a good conductor of electricity. If wire is coated with graphite then one cannot touch the wire. Sulphur is commercially not used as an insulating material and is toxic to handle.


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