. The electric potential is zero __________. (Inside a conductor, Midway between any two charges of the opposite signs, Midway between two equal charges of the sme sign)

Potential V = q/4? ? r where q- charge V-potential due to the charge q r-distance from the charge q Here ? means epsilon naught. Potential is a scalar quantity, it doesn't have direction. It simply gets added as any normal numbers. So lets assume that the two charges are a distance 2d apart. So the centre is at a distance of d from both the charges. -q ----------.---------- +q We have to find the potential at the center. So Potential at the center due to charge q is V1 = q/4? ? d and due to charge -q is V2 = -q/4? ? d. So the total potential is V1 + V2, which when you add is zero. As you can see, the potential will be 0 only when the charges have opposite signs, because only then both the potentials will cancel each other and give 0. Therefore, the answer is Option B. read less