A charged pendulum

Classical Mechanics Level 4

A pendulum consists of a small non-conducting bob of mass m tied of taught massless string. It is given a charge Q . A point positive charge is brought from infinity to the original place of the bob. The bob raises to a height h . Find the total work done.

Q 2 4 π ϵ 0 + m g h \frac{Q^{2}}{4\pi\epsilon_{0}}+mgh 2 m g h 2mgh Q 2 2 π ϵ 0 \frac{Q^{2}}{2\pi\epsilon_{0}} m g h mgh 4 m g h 4mgh Q 2 4 π ϵ 0 \frac{Q^{2}}{4\pi\epsilon_{0}} 3 m g h 3mgh Q 2 2 π ϵ 0 + 2 m g h \frac{Q^{2}}{2\pi\epsilon_{0}}+2mgh

Aditya Kumar by Aditya Kumar , 22, India

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