Question

A pendulum bob of mass 80 mg and carrying a charge of 2 x 10^-8 c is at rest in a horizontal field of 20,00 v/m find the tension

Answer 1

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As the electric field is in horizontal direction and the bob is positively charged it ... qE/mg Mass= 80 * 10^-6 kg. g = 9.8m/sq= 2* 10^-8.

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