Physics-
General
Easy
Question
A positively charged ball hangs from a silk thread. We put a positive test charge 
at a point and measure 
, then it can be predicted that the electric field strength 
- Cannot be estimated
The correct answer is:
Because of the presence of positive test charge q0 in front of positively charged ball, charge on the ball will be redistributed, less charge on the front half surface and more charge on the back half surface. As a result of this net force F between ball and point charge will decrease i.e. actual electric field will be greater than 
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