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The positive charge Q is placed in the cavity of the spherical conductor.

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the induced charge at the surface 1 is -Q and on the surface 2 is +Q

the surface charge density at inner surface is uniform

the surface charge density at the outer surface is uniform

the charge Q does not experience electric force if it is placed at the centre of the spherical cavity

answer is A, C, D.

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Detailed Solution

Apply Gauss law and property of conductor.Field inside the metal is zero.If the charge is placed at the centre ,it is attracted by the induced charge on the inner surface ,in the radially outward direction in all possible directions .

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