Overhead electrical wires are not insulated because:

air is a good conductor

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air is a bad conductor

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air offers friction

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to prevent theft

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Solution

The correct option is B air is a bad conductor
Overhead wires are generally hanging in air. Since air is bad conductor of electricity, there will be no damage. So, no need of insulation.

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Similar questions

Give scientific reasons.

(a) The copper wire used in an electro-magnet is insulated.

(b) In an electric bell, the electric current stops again and again.

(d) The fuse wire is made of a good conductor.

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