A metallic shell has a point charge 'q' kept inside its cavity. Which one of the following diagram correctly represents the electric lines of forces ?

Options

A.
B.
C.
D.

Answer

C

Explanation

`C+(1) +C_(2) = 25/6 ((C_(1)C_(2))/(C_(1)+C_(2)))`
`rArr 6( C_(1) +C_(2))^(2) = 25 C_(1)C_(2)`
` rAr 6C_(1)^(2) +6C_(2)^(2) - 13 C_(1)C_(2)=0" " ….(1)`
Let `C_(2) = x C_(1)`
eqn (1) becomes `6x^(2) - 13 x +6 = 0 `
` x = 3//2 or 2/3 `
Since `C_(2) gt C_(1)`
` x = 3//2 ` is not possible .