A point charge with charge q 1 = 3.40 ? C is held stationary at the origin. A se

Question

A point charge with charge q1 = 3.40?C is held stationary at the origin. A second point charge with charge q2 = -4.70?C moves from the point ( 0.100m , 0) to the point ( 0.285m , 0.270m ). How much work W is done by the electric force on the moving point charge? Express your answer in joules. Use k = 8.99 A point charge with charge q1 = 3.40?C is held stationary at the origin. A second point charge with charge q2 = -4.70?C moves from the point ( 0.100m , 0) to the point ( 0.285m , 0.270m ). How much work W is done by the electric force on the moving point charge? Express your answer in joules. Use k = 8.99

Explanation / Answer

Work done

= change in potential energy

Here, r1 = 0.1 m

r2 = sqrt(0.285^2 + 0.270^2) = 0.39 m

Thus, Change in potential energy

= - 9 * 10^9 * 3.40 * 4.70 * 10^-12 (1/0.39 - 1/0.1)

= 1.07 J

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