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Gravitation vs. Electrostatics

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Question

What is the amount of work done in moving a point charge Q around a circular arc of radius 'r' at the centre of which another point charge 'q' is located?

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Solution

As the displacement and and centripetal force (electrostatic attraction force between charges ) are perpendicular to each other therefore work done

$W = F d cos 90^{0} = 0$

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