Two coaxial solenoids of different radius carry current I in the same direction. `vec(F_1)` be the magnetic force on the inner solenoid due to the outer one and `vec(F_2)` be the magnetic force on the outer solenide due to the inner one. Then

Options

A. `vec(F_1)` is radially inward and `vec(F_2)`
B. `vec(F_1)` is radially outwards and `vec(F_2)=0`
C. `vec(F_1)=vec(F_2)=0`
D. `vec(F_1)` is radially inwards and `vec(F_2)` is radially outwards

Answer

C

Explanation

(c) `vec(F_1)=vec(F_2)=0`
beacuse of action and reaction pair .