Physics · 2020
JEE Main · 9 January 2020, Shift 1 · Q12
A long, straight wire of radius a carries a current distributed uniformly over its cross-section. The ratio of the magnetic fields due to the wire at…
A long, straight wire of radius a carries a current distributed uniformly over its cross-section. The ratio of the magnetic fields due to the wire at distance $\displaystyle \frac{\mathrm{a}}{3}$ and $\displaystyle 2$ a , respectively from the axis of the wire is :
Official answer
(3)
$\displaystyle 2$/$\displaystyle 3$
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JEE Main 2020 Physics question, with the answer from NTA’s final answer key. Where our answers come from.