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Charged concentric spheres

A charge is located at the centre of a sphere A (radius RA = 0.0010 m) which is in the centre of sphere B (radius RB = 0.0012m).
Suppose A and B are both equipotential surfaces . What is the ratio VA/VB of the potentials of these surfaces?


The potential of the inner sphere VA = kQ/RA.
The potential of the outer sphere VB = kQ/RB
Therefore the ratio VA/VB = RB/RA = 0.0012/0.0010 = 1.2
© Keith Gibbs 2011