this is the qn with the correct answer
what i dont understand is why do they minus for the electric field from both the POSITIVE charges to make it 0??? its TWO POSITIVE charges so shouldnt u add them up since minus is only for One positive and One negative charge????
also explain why the answer to the next part of the qn is 0: A charge of +4.5 μC is placed at point P.
State the magnitude of the force acting on this charge.