If 500 electrons are placed on a conducting sphere of radius 10 μm, what is the potential at the surface of the sphere?

Question

Quizplus · Accepted Answer

The potential at the surface of a conducting sphere is given by V = Q/4*pi*epsilon*r, where Q is the charge on the sphere, r is the radius of the sphere and epsilon is the permittivity of free space.

Plugging in the given values, we get: 
V = (500*1.6*10^-19 C)/(4*pi*8.85*10^-12 F/m*10*10^-6 m) = -0.072 V ≈ -72 mV

Therefore, the best choice is (D).

If 500 Electrons Are Placed on a Conducting Sphere of Radius