Question

A thin, metallic spherical shell contains a charge Q on it. A point charge q is placed at the centre of the shell and another charge q1 is placed outside it as shown in the figure (30-Q1). All the three charges are positive. The force on the charge at the centre is
(a) toward left
(b) towards right
(c) upward
(d) zero
Figure

Answer 1

Force on the charge at the center becomes zero.

Explanation:

• It can be observed that the metal is in a spherical shape. The charge of q1 outside the shell is positive, so it induces positive charge from outside, which will result in the production of negative charge inside.
• Then, inside the shell, the electric field becomes zero. If there is an electrical force, then the electrons move.
• But, as the electric field comes in from different directions, the movement of electrons stops, thus the electric field becoming zero. So, there will be no force in q.

Answer 2

Answer:

⚡FORCE ON THE CHARGE AT THE CENTRE IS ZERO⚡

1. This is because there is no electric field inside a metallic shell whatever be the charges placed outside.