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2014-08-04T22:21:32+05:30
A.)because they are insulators
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2014-08-04T22:28:07+05:30

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Option A.

Electric wires are dangerous for human beings. The high votagecan damage or even kill a person.  In order to protect us from the wires, sheilding or covering is done for the wires.
THe materials are non conductors or called insulators. they donot transmit electricity through them. so we are safe.

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