As shown in the figure, a point charge Q is placed at the centre of a conducting spherical shell of inner radius a and outer radius b. The electric field due to charge Q in three different regions I, II and III is given by: [I: r<a, II: a<r<b, III: r>b] Image
Options

Question

As shown in the figure, a point charge Q is placed at the centre of a conducting spherical shell of inner radius a and outer radius b. The electric field due to charge Q in three different regions I, II and III is given by: [I: r<a, II: a<r<b, III: r>b] Image

Options

G1 Physics · Accepted Answer

In the cavity region r<a, the central charge produces a nonzero field. Inside the conducting material a<r<b, electrostatic field is zero. Outside the shell, the net enclosed charge is nonzero, so field is nonzero. Hence option 2.