A point particle of mass \( M \) attached to one end of a massless ...

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A point particle of mass \( M \) attached to one end of a massless rigid non- conducting rod of length \( L \). Another point particle of the same mass is attached to the other end of the rod. The two particles carry charges \( +q \) and \( -q \)
P respectively. This arrangement is held in a region of a uniform electric field \( E \) such that the rod makes a small
W) angle \( \theta \) (say of about 5 degrees) with the field direction. Find an expression for the minimum time needed for the rod to become parallel to the field after it is set free. (1989, 8M)
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