(d) Electric wires have a plastic covering.
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Most electrical wire is covered in a rubber or plastic coating called insulation. ... The purpose of insulation covering the metal part of an electrical wire is to prevent accidental contact with other conductors of electricity, which might result in an unintentional electric current through those other conductors.
The electric wires are covered with plastic as plastic are the plastics are insulators or bad conductor of electricity.
They are used for the safety as they prevent Electrical shock.
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