Physics · 2020
JEE Main · 5 September 2020, Shift 2 · Q15
An iron rod of volume 10^-3 m^3 and relative permeability 1000 is placed as core in a solenoid with 10 turns/cm. If a current of 0.5 A is passed…
An iron rod of volume $\displaystyle 10^{-3} \mathrm{~m}^3$ and relative permeability $\displaystyle 1000$ is placed as core in a solenoid with $\displaystyle 10$ turns/cm. If a current of $\displaystyle 0.5$ A is passed through the solenoid, then the magnetic moment of the rod will be :
Official answer
(1)
$\displaystyle 5 \times 10^2 \mathrm{Am}^2$
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JEE Main 2020 Physics question, with the answer from NTA’s final answer key. Where our answers come from.