The charge resides on the shell surface. The potential at P1, outside point, is
V = (1/4®®0) . (q/r)
The potential at P2, surface point is
V = (1/4pe0). (q/R)
The potential at P3, (inside point) is
V = Vsurface
V = (1/4pe0 (q/R)
It is constant inside the shell (same at all points inside the shell)
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