A spherical conducting shell has an inner radius of 0.2 m and an outer radius of 0.4 m. There is a positive charge uniformly spread on the inner surface. All charges remain at rest. The potential at a point 0.1m from the center of the cavity is +2V. The potential points on the outer surface may be a) +2V b) 0 c) -2V d) more than one option above e) none of the above

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