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Electrostatic Potential Energy and Potential Difference

Question

A particle of positive charge $$Q$$ is fixed at point $$P$$. A second particle of mass $$m$$ and negative charge $$-q$$ moves at constant speed in a circle of radius $$r_1$$, centered at $$P$$. Derive an expression for the work $$W$$ that must be done by an external agent on the second particle to increase the radius of the circle of motion to $$r_2$$.

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Q1

A particle of positive charge $$Q$$ is fixed at point $$P$$. A second particle of mass $$m$$ and negative charge $$-q$$ moves at constant speed in a circle of radius $$r_1$$, centered at $$P$$. Derive an expression for the work $$W$$ that must be done by an external agent on the second particle to increase the radius of the circle of motion to $$r_2$$.

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Q2

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