A thin. Metallic spherical shell contains s charge Q on it. A point charge q is placed at the centre of the shell and another charge `q_1` is placed outside it as shown in figure (30-Q1). All the three charges are positive. The force on the charge at the centre is

Options

A. toward right
B. toward left
C. zero
D. none of these

Answer

C

Explanation

c. Electric field is zero inside the shell due to the outside
changes.