Question

Four charges +q , +q , -q and –q are placed respectively at the four corners A,B, C and D respectively of

a square of side a. Calculate the force on charge Q placed at the centre of the square.​

Answer 1

Answer:

if you are referring to the resultant force,

it will be zero but, if you ask about the forces each of them will exert individually,

then,

for q+ it will be constant*qQ/r² where r=diagonal/2

for q- it will be constant*-qQ/r² where r=diagonal/2