Physics · 2021
JEE Main · 26 August 2021, Shift 1 · Q11
The fractional change in the magnetic field intensity at a distance 'r' from centre on the axis of current carrying coil of radius 'a' to the…
The fractional change in the magnetic field intensity at a distance 'r' from centre on the axis of current carrying coil of radius 'a' to the magnetic field intensity at the centre of the same coil is : (Take $\displaystyle \mathrm{r}<\mathrm{a}$ ).
Official answer
(4)
$\displaystyle \frac{3}{2} \frac{\mathrm{r}^2}{\mathrm{a}^2}$
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JEE Main 2021 Physics question, with the answer from NTA’s final answer key. Where our answers come from.