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Q.

A point particle of mass M is 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 particle carry charges + q and – q respectively. This arrangement is held in a region of a uniform electric field E such that the rod makes a small angle θ (say of about 5°) with the field direction (see figure). The expression for the minimum time needed for the rod to become parallel to the field after it is set free.

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a

t=π2mL2qE

b

t=π2mLqE

c

t=π22mLqE

d

t=π23mL2qE

answer is A.

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