Two point masses m each carrying charge –q and +q are attached to the ends of a massless rigid non-conducting rod of length l. The arrangement is placed in a uniform electric field E such that the rod makes a small angle `5^0` with the field direction. The minimum time needed by the rod to align itself along the field is ........
Options:
(a) `t = π sqrt((2ml)/(3qE))`
(b) `t = π /2sqrt((ml)/(qE))`
(c) `t = sqrt((ml)/(qE))`
(d) `t = 2π sqrt((ml)/E)`