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Charging by Induction:
Charging by induction is a charging process that involves charging an object without touching the object to a charged object. The charged object is brought near to the object to be charged (a neutral object). The charged object's presence induces a movement of electrons within the neutral object, causing it to become polarized. Then the neutral object is touched to a ground, causing a transfer of electrons between ground the neutral object. The ground is pulled away, the charged object is pulled away and the neutral object has been charged. When the process is complete, both objects are charged with the opposite type of charge.
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Opposites attract. Likes repel. And only electrons can move. That's the key to understanding charging by induction. When the balloon is brought near can X, a movement of electrons is induced within can X and can Y. Which way do electrons move? Being attracted by the positively charged balloon, electrons in can Y move to get closer to the attractive balloon. Charge is now polarized within the two can system, with can Y having lost electrons and can X having gained electrons. When the cans are separated, each can is charged. Can X is said to have been charged by induction with the positively charged balloon. Can Y has served as the ground, providing electrons to can X.
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