Question

The accompanying figure shows two concentric spherical shells isolated from each other. The smaller shell has radius b and net charge +Q. The larger shell has radius 2b and net charge –Q. If R is the distance from the common center, which is wrong

• A. the highest electric field magnitude E occurs immediately outside the smaller (R = b) shell
• B. the highest electric field magnitude E occurs immediately outside the larger (R = 2b) shell
• C. At R = b potential is máximum
• D. At R = 0 potential is maximum

Answer 1

The correct option is B

the highest electric field magnitude E occurs immediately outside the larger (R = 2b) shell

Electric field between shells $E=\frac{kQ}{r^2}$

$E_{max}=\frac{kQ}{b^2}atr=b$

$E_{inside}$ inner shall = 0

V is constant and maximum inside the shell