question_answer

A circular wire loop of radius x carries a total charge q distributed uniformly over its length. A small length dl of the wire is cut off. Find the value of m if \[\frac{qdl}{m{{\pi }^{2}}{{\varepsilon }_{0}}{{a}^{3}}}\]be the electric field a center due to remaining wire.

A) 5                     

B)        6

C) 3                     

D)        8