JEE MAIN - Physics (2015 (Offline) - No. 8)
Two coaxial solenoids of different radius carry current $$I$$ in the same direction. $$\overrightarrow {{F_1}} $$ be the magnetic force on the inner solenoid due to the outer one and $$\overrightarrow {{F_2}} $$ be the magnetic force on the outer solenoid due to the inner one. Then :
$$\overrightarrow {{F_1}} $$ is radially in wards and $$\overrightarrow {{F_2}} = 0$$
$$\overrightarrow {{F_1}} $$ is radially outwards and $$\overrightarrow {{F_2}} = 0$$
$$\overrightarrow {{F_1}} = \overrightarrow {{F_2}} = 0$$
$$\overrightarrow {{F_1}} $$ is radially inwards and $$\overrightarrow {{F_2}} $$ is radially outards
Förklaring
$$\mathop {F{}_1}\limits^ \to = \mathop {F{}_2}\limits^ \to = 0$$
because of action and reaction pair
because of action and reaction pair