Two coaxial solenoids of different radii carry current $I$ in the same direction. Let $\;{\overrightarrow {\;F} _1}$ 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
JEE MAIN 2015, Medium
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(Both solenoids are taken to be ideal in nature.)
Both wires will attract each other, but net force on each wire will be zero.
Concept: Two current carrying elements attract each other if direction of current is same.
$\overrightarrow {{F_1}} =\overrightarrow {\;{F_2}} =0$
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