A solid spherical conductor of radius R has a spherical cavity of radius a(a<R) at its centre. The chargew at the inner surface, outer an the position r(a<r<R) are ?

Dear Student,

If we put a charge Q in the cavity, It will induce a -Q charge on the inner surface and a Q charge on the outer surface.

Thus surface charge density
Inner:σinner: Q4πε0a2   Outer: σouter=Q4πε0R2

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