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The line AA' is on a charged infinite co...

The line AA' is on a charged infinite conducting plane which is perpendicular to the plane of the paper. The plane has surface density of charge `sigma` and B is a ball of mass m with a like charge of magnitude q. B is connected by a string from a point on the line AA'. The tangent of the angle `(theta)` formed between the line AA' and the string is (provided, the charge q does not affect the distribution of charge on conducting plate)

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