Question

A conducting shell of radius R carries charge –Q. A point charge +Q is placed at the centre of shell. The electric field E varies with distance r (from the centre of the shell) as :

• A.
• B.
• C.
• D.

Answer 1

Answer: (A)

Answer 2

Using gauss theorem,

E = $\frac{1}{4\pi\varepsilon_{0}}$. $\frac{Q}{r^{2}}$ for r £ R and E = 0 for r ³ R

\ correct graph is (1)