1.

A point mass M is attached to one end of a masslesa rigid non-conducting rod of length L. Another equal point mass is attached to the other end of the rod. The two particles carry charges +q and -q respectively. This arrangement is held I the region of uniform electric field E such that the rod makes a small theta (say about 5^(@)) with field direction. Moment of inertia of the rod is I. Now answer the question Time period for the rod to become parallel to E is

Answer»

`2pi sqrt(ML)/(QE))`
`(2pi)/3sqrt((ML)/(qE))`
`(pi)/3sqrt((ML)/(2QE))`
`(pi)/4sqrt(ML)/(2qE))`

Answer :C


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