Two equal insulating threads are placed parallel to each other. Separation between the threads (= d) is much smaller than their length. Both the threads have equal and opposite linear charge density on them. The electric field at a point P, equidistant from the threads (in the plane of the threads) and located well within (see figure) is `E_0`. Calculate the field at mid point (M) of line AB.

Answer

`(E_(0))/(2)`