Question

Inside a neutral metallic spherical shell, a charge $Q_1$ is placed, and outside the shell, a charge $Q_2$ is placed.

Answer 1

Electric field due to any point charge is $E=k\frac{q}{r^2}$. So it is depend on the charge and distance.

A) As charge $Q_1$ is placed at center so field inside the shell is remains non zero. i.e, $E=k\frac{Q_1}{r^2}\ne 0$.

Thus, $A\to 2$

B) charge $Q_1$ is not at center but total charge remains same inside the shell will be same. So field inside the shell is remains non zero. i.e, $E=k\frac{Q_1}{r^2}\ne 0$. Thus, $B\to 2$

C) As position of $Q_1$ is changed so field inside will be changed but non zero.

$C\to 2,3$

D) similarly when position of $Q_2$ is changed ,filed inside remains non zero but field outside will change. thus ,$D\to 2,4$