Two metal spheres, each of radius 4.3 cm, have a center-to-center separation of

Question

Two metal spheres, each of radius 4.3 cm, have a center-to-center separation of 1.9 m. Sphere 1 has a charge of +1.2 x 10-8 C; sphere 2 has a charge of -3.1 x 10-8 C. Assume that the separation is large enough for us to assume that the charge on each sphere is uniformly distributed (the spheres do not affect each other). With V = 0 at infinity, calculate in volts (a) the potential at the point halfway between their centers and the potential on the surface of (b) sphere 1 and (c) sphere 2.

for A: -180 V
B: _____ V (ANSWER IS NOT 2511 OR -2511)
C: -6488 V

Explanation / Answer

b)

-9e9*3.1e-8/(1.6) + 9e9*1.2e-8/(4.3e-2) = +2337

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