Question

intensity of electric field equation at a point midway between the charges​

Answer 1

Let A be the point midway between the two charges.

Electric field intensity at A due to the two charges:

$e = \frac{kq1}{ {x}^{2} } + \frac{kq2}{ {x}^{2} }$

If the two charges are equal in magnitude and opposite in sign, then E reduces to zero.