Question

when a body is rubbed with another then why body get charged​

Answer 1

because two uncharged boby get easily charged and our body is a uncharged boby

Answer 2

Molecules in the fur have a stronger attraction for electrons than the molecules in the rubber rod. During a charging by rubbing (or by friction) process, the material that becomes negatively charged does so because it simply likes electrons more than the material with which it is rubbed.

hope it helps you