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 E) zero

Question

Quizplus · Accepted Answer

For $r_a \le r \le r_b1$, the potential inside the conducting spherical shell is constant and equal to the potential at the inner surface of the shell, which is also the potential of the solid sphere because the electric field inside conductors is zero. Thus, $$V = \frac{kQ}{r_a}$$ For $r_b1 \le r \le r_b2$, the potential is again constant because the electric field inside a conductor is zero. The potential is equal to the potential at the outer surface of the conducting shell, which is zero because the shell is uncharged. Thus, $$V = 0$$ Therefore, the correct answer is (A).

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