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A pendulum bob has mass 4 mg and carriea...

A pendulum bob has mass 4 mg and carrieas a charge `2xx10^(-9)` coulomb. It hangs in equilibrium from a massless thread of length 50 cm whose other end is fixed to a vertical wall. A horizontal electtic field of inetensity 20000 V/m exists in space. Calculate
a. Angle made by the thread with the vertical
b. Tension in the thread

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