Two point charges +Q and +Q are separated by a certain distance. The resultant electric field is

Given data:

Charges=Q

Concepts used: electric field

Detailed solution:

The midpoint is a null point where the resultant electric field will be zero.

At any point on the perpendicular bisector, 

the field due to each point can be divided into two components(parallel , perpendicular to bisector), the perpendicular components due to the charges will cancel out and the resultant will be along the direction of bisector.