Question

give reason for covering copper rod by insulating matarial

Answer 1

copperrod is covered by insulating material because copper is a good conductor of heat and electricity. to make the copper rod safe insulators such as plastics are used.
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Answer 2

An insulating material is a material that reduces or prevents the flow of electricity. There are 3 main factors due to which copper is covered with an insulating material: ... Since copper is a good conductor of heat and electricity, hence uninsulated copper wire is more prone to electrical shorts.