Two point particles of same mass M are attached to two ends of a massless non-conducting rigid rod of length l. The charge on particle are +q and -q. The rod is held in a region of uniform electric field E making an angle $\theta $( very small) with E. When rod is released , its angular frequency will be :

Question

 

$(A)\;\frac{1}{2} \bigg( \frac{qE}{Ml}\bigg)^{1/2} \\ (B)\; \bigg( \frac{2qE}{Ml}\bigg)^{1/2}\\ (C)\; \bigg( \frac{qE}{Ml}\bigg)^{1/2} \\ (D)\; \bigg( \frac{qE}{2Ml}\bigg)^{1/2} $