When an object gets charged by induction, a charge is created by the influence of a charged object but not by contact with a charged object. The word induction means to influence without contact. In the example shown below, the electroscope gets charged without any contact with the charged object brought in from the top.
There are several advantages to charging something by induction.
The table below compares charging by Conduction to charging by Induction.
Charging by Conduction
Charging by Induction
|Charged object touches the electroscope.||Charged object does not touch the electroscope.|
|Electroscope ends up similarly charged to the object used to charge it.||Electroscope ends up oppositely charged to the object used to charge it.|
|The first charge is strong but gets weaker each time the electroscope is recharged. (This is due to the original object giving up some charge every time it is touched.)||The first charge is strong and stays strong each time the electroscope is recharged. (This is due to the original object not losing any charge in the process.)|
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