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Physics · 2015
JEE Main 2015 · 2015-04-04 Offline · Q19
Two coaxial solenoids of different radii carry current I in the same direction. Let F_1 be the magnetic force on the inner solenoid due to the outer…
Two coaxial solenoids of different radii carry current I in the same direction. Let $\displaystyle \overrightarrow{\mathrm{F}_1}$ be the magnetic force on the inner solenoid due to the outer one and $\displaystyle \overrightarrow{\mathrm{F}_2}$ be the magnetic force on the outer solenoid due to the inner one. Then :
Official answer
(4)
$\displaystyle \overrightarrow{\mathrm{F}_1}$ is radially outwards and $\displaystyle \overrightarrow{\mathrm{F}_2}=0$
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JEE Main 2015 Physics question, with the answer from NTA’s final answer key. Where our answers come from.