Question

Three concentric conducting spherical shells carry charges $+4Q$ on the inner shell, $-2Q$ on the middle shell and $+6Q$ on the outer shell. The charge on the inner surface of the outer shell is :

• A. $0$
• B. $4Q$
• C. $-Q$
• D. $-2Q$

Answer 1

Answer: (D)

$-2Q$

The total charge inside each shell is zero. According to this the charge distributions will be as shown in figure.
Thus, the charge on inner surface of outer shell is $-2Q$ as shown in figure.