Question

A uniformly charged rigid rod is positioned along the longitudinal axis of a uniformly charged ring, halfway through the ring, as shown in the figure.

E

2R

The net electric charge of the rod is 4 μC and the net electric charge of the ring is 5 μC. What is the magnitude of the electric force (in uN) exerted by the ring on the rod if R = 0.2

m and the system is in vacuum.

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