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## Homework Statement

I calculated the capacitance of two concentric conducting spherical shells of radii a and b (a<b) when the inner shell has charge Q and outer has charge -Q correctly by using C=Q/(V(i)-V(o)), the problem I have is described below in "attempt at a solution"

## Homework Equations

All electrostatics formulas

## The Attempt at a Solution

while calculating it, I ignored that the outer shell was grounded as I have no idea what grounding does. Now I require to calculate the capacitance when the inner shell is grounded, this time- my answer was incorrect. I wish to know if it is alright to ignore earthing as the answer was correct anyway in the first case or whether I'm missing something? what would happen if the inner shell was earthed? does it become neutral as excess of charge is removed?