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# An infinite plane of positive charge has a surface charge density s. A metal ball B of mass m and charge $\theta$ is attached to a thread and tied to a point A on the sheet PQ. Find the angle $\theta$ which AB makes with the plane PQ.

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## 1 Answer

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$\tan ^{-1} \bigg[ \large\frac{\theta \sigma}{2 \in_0 mg}\bigg]$
Hence B is the correct answer.
answered May 30, 2014 by