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.

Question

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.

Infinity Learn · Accepted Answer

$$T=2$$$$π$$IpE

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