A Solid Conducting Sphere of Radius R_a Is Placed Concentrically $\lt$

question 1

Multiple Choice

A solid conducting sphere of radius r_a is placed concentrically inside a conducting spherical shell of inner radius r_b1 and outer radius r_b2. The inner sphere carries a charge Q while the outer sphere does not carry any net charge. The potential for r $\lt$ r_a is

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