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A pendulum bob of mass 80 milligram and carrying a charge of $2 × 10^{-8}\; C$ is at rest in a horizontal uniform electric field of 2 × 10^{4} Vm^{-1}$. Calculate the tension in the thread of the pendulum and the angle it makes with the vertical.

1 Answer

$8.8 \times 10^{-4} \;N$
Hence A is the correct answer.
answered May 30, 2014 by meena.p