Question

Three concentric conducting spherical shells have radii r, 2r, and 3r and charges `q_1,q_2 and q_3`, respectively. Innermost and outermost shells are earthed as shown in figure. The charges shown are after earthing. Select the correct alternative.

A. `q_1+q_3 = -q_2`
B. `q_1 = - q_2`
C. `q_3/q_2 = -1/3`
D. none of these

Answer 1

Correct Answer - A
Potential of outer sphere
`V=(kq_(1))/(3r)+(kq_(2))/(3r)+(kq_(1))/(3r)=0`
or `q_(1)+q_(3)=-q_(2)`