Electrostatics

Question: A pendulum bob of mass $30.7 \times {10^{ - 6}}\,kg$ and carrying a charge $2 \times {10^{ - 8}}\,C$ is at rest in a horizontal uniform electric field of 20000 V/m. The tension in the thread of the pendulum is $(g = 9.8\,m/{s^2})$

1) $3 \times {10^{ - 4}}\,N$

2) $4 \times {10^{ - 4}}\,N$

3) $5 \times {10^{ - 4}}\,N$

4) $6 \times {10^{ - 4}}\,N$

Solution:

Explanation: Explanation

electric-field-potential

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