Physics · 2020
JEE Main · 6 September 2020, Shift 2 · Q15
A square loop of side 2a and carrying current I is kept in x z plane with its centre at origin. A long wire carrying the same current I is placed…
A square loop of side 2a and carrying current I is kept in $\displaystyle x z$ plane with its centre at origin. A long wire carrying the same current I is placed parallel to z-axis and passing through point $\displaystyle (0, \mathrm{~b}, 0),(\mathrm{b} \gg \mathrm{a})$. The magnitude of torque on the loop about $\displaystyle z$-axis will be :
Official answer
(2)
$\displaystyle \frac{2 \mu_0 I^2 a^2 b}{\pi\left(a^2+b^2\right)}$
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JEE Main 2020 Physics question, with the answer from NTA’s final answer key. Where our answers come from.