Induction

A process by which a charged object can give another object an opposite charge without losing any of its own charge.

1. Given an uncharged object insulated from receiving or losing any charges...
2. In the presence of an external electric charge, all of the similar charges are repelled to the opposite side of the object, temporarily polarizing the object .
3. A conductor is applied to remove the repelled charge into the ground
4. The conductor is removed, leaving only the oppositely charged pole
5. The external charge is removed from the system, and the object retains a charge opposite to the external charge.

Electric Forces on Uncharged Objects

Even if the object is an insulator, its atoms become polarized. This is why uncharged objects are attracted to both positively charged objects and negatively charged objects