Two parallel conducting plates are separated by a distance d. A potential difference V is applied between the plates and a charge Q is placed halfway between them, as shown.
Which of the following gives the magnitude of the force acting on the charge?
The only correct answer is D because E = V/d and F = EQ
A is not correct because this includes (× d) instead of (÷ d)
B is not correct because this is half the correct value, incorrectly using d/2 because
Q is hallway between the plates
C is not correct because this has reversed Q and d