question_answer

Two coaxial solenoids of different radii carry current I in the same direction. Let \[{{\vec{F}}_{1}}\]be the magnetic force on the inner soleoid due to the outer one and \[{{\vec{F}}_{2}}\]be the magnetic force on the outer solenoid due to the inner one. Then:                                        [JEE MAIN 2015]

A) \[{{\vec{F}}_{1}}\]is radially inwards and \[{{\vec{F}}_{2}}=0\]

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 onwards