Overhead cables need not be insulated because :

air is a bad conductor of electricity

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air is a good conductor of electricity

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bare wires conduct electricity better than insulated wires

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none of these

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Solution

The correct option is A air is a bad conductor of electricity
As we know air is a bad conductor (It consists of mostly nitrogen and oxygen which are electrically neutral and are not easily ionized) of electricity. So, Overhead cables need not be insulated.

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