A charge of 5 nC is uniformly distributed around a ring of radius 10 cm that has its center at the origin and its axis along the x axis. A point charge of 1 nC is located at x = 0.75 m. Find the work required to move the point charge to origin. Hint: The electric field on the axis was calculated in class (see Example 3 in the the slides for Lecture 15).
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