A spherical conductor `A` contains two spherical cavities as shown in Fig.2.127. The total charge on conductor itself is zero . However , there is a point charge `q_(1)` at the center of one cavity and `q_(2)` at the center of the other cavity . Another charge `q_(3)` is placed at a large distance `r` from the center of the spherical conductor.

Which of the following statements are true ?

Options

A. Charge `q_(3)` applies a larger force on the charge `q_(2)` than on charge `q_(1)`.
B. Charge `q_(3)` applies a smaller force on the charge `q_(2)` than on charge `q_(1)`.
C. Charge `q_(3)` applies equal force on both the charges.
D. Charge `q_(3)` applies no force on any of the charges.

Answer

D

Explanation

Charges outside cavity of a conductor have no influence on the field inside cavity.