When a positively charged body, say P is brought near another body Q which does not have any charge on it, a negative charge will be induced on Q, on the portion nearness to P. And a positive charge, equal in magnitude to the induced negative charge will appear at the other end or Q farthest from P. That the negative and positive charges induced on Q are equal in magnitude.
The negative induced charge on Q are positive inducing charge on P are said to be Bound Charges, (because each of them remains held by each other and cannot go away) ; whereas the positive charge on Q is said to be Free Charge (it can be conducted away from the body).
Now, if the body Q is connected to earth by a conductor, the free positive charge on Q will flow from Q to earth leaving behind the bound negative charge on Q.
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