Physics · 2020
JEE Main · 8 January 2020, Shift 2 · Q12
A very long wire ABDMNDC is shown in figure carrying current I. AB and BC parts are straight, long and at right angle. At D wire forms a circular…
A very long wire ABDMNDC is shown in figure carrying current I. AB and BC parts are straight, long and at right angle. At D wire forms a circular turn DMND of radius R. AB, BC parts are tangential to circular turn at N and D. Magnetic field at the centre of circle is :
Official answer
(1)
$\displaystyle \frac{\mu_0 \mathrm{I}}{2 \pi \mathrm{R}}\left(\pi+\frac{1}{\sqrt{2}}\right)$
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JEE Main 2020 Physics question, with the answer from NTA’s final answer key. Where our answers come from.