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When an object is charged by induction, there is no physical contact between the object being charged and the object used to do the charging, In contrast, charging.by contact, as the name implies, involves the direct physical contact to transfer charge from one object to the another
process of charging an uncharged body by bringing it in contact with a charged body. Suppose we bring a neutral object in contact with a negatively charged body then some of the negatively charged electrons will get transferred to the neutral body and make it carry a net negative charge.
process of charging a neutral body by bringing it near a charged body but not in contact. Suppose we want to provide a net positive charge to a neutral metal plate, then in this process, we will bring a negatively charged body near the neutral metal plate. This will accumulate positive charges in the neutral metal plate near the side which faces the charged body, and all the electrons will accumulate on the opposite side. If we connect this side of the metal plate to the earth, then all the electrons will move to the earth. Now, if we remove the earthing and the charged body, the bounded positive charge will redistribute themselves in the metal plate, and it will become positively charged.

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