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Surface Integral

When does a c...

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When does a charged circular loop behave as a point charge?

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Q. A point charge

q_{1}

, is held stationary at the origin. A second charge

q_{2}

is placed at a point a, and the electric potential energy of the pair of charges is

- 6.4 \times 10^{- 8} J

. When the second charge is moved to point b, the electric force on the charge does

4.2 \times 10^{- 8} J

of work. What is the electric potential energy of the pair of charges when the second charge is at point b?

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