Question

4 equal charges of 2.0x10^-6 Coulombs are situated at the corners of a square of side 1meter. Find the electric field at the center of the square.

Answer 1

Diagram according to the given question is, 

 

Now,  direction of electric field at the center of  the square is as given below.

 

Electric field due to A and Electric field due to C are in opposite direction and same in magnitude( due to same charges present at A and C and corners have same distance from the center ) so it cancels each other.

Similarly, Electric field due to B and Electric field due to D  are in opposite direction and same in magnitude( due to same charges present at B and D and corners have same distance from the center ) so it cancels each other.

So, net electric field at center of the square is zero.

I HOPW YOU WILL UNDERSTAND.