A thin metallic spherical shell contains a charge +10 μC on it. A point charge +2 μC is placed at the centre of the shell and another charge +5 μC is placed outside it as shown. The force on the charge +2 μC at the centre is:

zero

The correct answer is Option (4) → zero

The spherical shell creates no net electric field inside (electrostatic shielding), so the +2μc experience no force due to the shell.

The +5μc charge outside the shell also cannot exert force because the electric filed due to it is blocked by shell.

Hence, no force is zero.