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Homework Statement:

A conducting spherical shell has charge Q and radius R1. A larger
concentric conducting spherical shell has charge −Q and radius
R2. If the outer shell is grounded, explain why nothing happens to
the charge on it. If instead the inner shell is grounded, find its final
charge.
Homework Equations:
 ##V=\int_\infty ^a \vec E\cdot d\vec l##
Hi! I need help with this problem.
When the outer shell is grouded, its potential goes to zero, ##V_2=0## and so does it charge, right? ##Q=0##. So the field would be the one produced by the inner shell ##E=\frac{Q}{4\pi\epsilon_0 R_1^2}##.
When the inner shell is grounded, I think that something similar would happen, ##V_1=0## and ##Q=0##, but I think it is wrong, because the problem asks me to find the final charge of the inner shell. I'm pretty confused about what happens when a conductor is grounded.