Physics - Electrostatics Question with Solution | TestHub

A particle of mass$\mathrm{M}$and charge$\mathrm{Q}$is attached to a string of length$\mathrm{L}$. It is whirled into a vertical circle in field$\mathrm{E}$. The speed of the particle at point$\mathrm{A}$, so that the tension in the string at$\mathrm{A}$is ten times the weight of particle, is -$(\mathrm{g}\mathrm{ }=\mathrm{a}\mathrm{c}\mathrm{c}\mathrm{e}\mathrm{l}\mathrm{e}\mathrm{r}\mathrm{a}\mathrm{t}\mathrm{i}\mathrm{o}\mathrm{n}\mathrm{ }\mathrm{d}\mathrm{u}\mathrm{e}\mathrm{ }\mathrm{t}\mathrm{o}\mathrm{ }\mathrm{g}\mathrm{r}\mathrm{a}\mathrm{v}\mathrm{i}\mathrm{t}\mathrm{y})$