what is charging by induction
Answers
There are a variety of methods to charge an object. One method is known as induction. In the induction process, a charged object is brought near but not touched to a neutral conducting object. The presence of a charged object near a neutral conductor will force (or induce) electrons within the conductor to move.
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During the induction process, there is never any movement of electrons from the charged object to the sphere. The charged object is only used to induce electron movement. Electrons, being negatively charged, move about the conducting sphere as they are repelled by the negatively charged tube. Once the ground is touched to the sphere, the electrons can even move further from the negatively charged tube by leaving the sphere and moving through the ground. It is at this point that the sphere acquires an unbalance of charge. Since there was a loss of negative charge in the form of electrons, the overall charge on the sphere is positive.
The induction process is characterized by the following general features:
A charged object is needed to charge an object by induction. Yet there is never any contact made between the charged object and the object being charged.
Only conductors can be charged by the induction process. The process relies on the fact that a charged object can force or induce the movement of electrons about the material being charged.
The object being charged ends up with a charge which is the opposite of the object being used to charge it.
A ground must be used to charge on the object. The ground allows for electron movement into or out of the object being charged.