Figure shows a ball having a charge q fixed at a point . Two identical balls having charges +q and –q and mass ‘m’ each are attached to the ends of a light rod of length . The rod is free to rotate about a fixed axis perpendicular to the plane of the paper and passing through the mid-point of the rod. The system is released from the situation shown in figure. Find the angular velocity of the rod when the rod becomes horizontal.
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Concept Questions :-
3. Initial potential energy of the system = 0 ..…(i)
The rod will rotate in clockwise sense.
When rod becomes horizontal
loss in P.E. = = gain in K.E.