A charged ball B hangs from a silk thread $S$ which makes an angle $\theta$ with a large charged conducting…
A charged ball B hangs from a silk thread $S$ which makes an angle $\theta$ with a large charged conducting sheet $\mathrm{P}$, as show in the figure. The surface charge density $\sigma$ of the sheet is proportional to
$\cos \theta$
$\cot \theta$
$\sin \theta$
$\tan \theta$
Solution
$\tan \theta=\frac{q \sigma}{\left(2 \varepsilon_{\circ}\right) m g}$
