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Electric Field Due to a Sphere and Thin Shell

12 equal char...

Question

12 equal charges q are situated at the corners of a regular 12 sided polygon . What is the net force on the test charge Q at the centre?

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Solution

when all the charges were there, net force is zero because all the charges will apply a repulsive force on the test charge.

Charges opposite to each other will cancel out. Hence net force = 0

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