Physics · 2022
JEE Main · 30 June 2022, Shift 1 · Q39
A coil of n number of turns wound tightly in the form of a spiral with inner and outer radii r_1 and r_2 respectively. When a current of strength I…
A coil of n number of turns wound tightly in the form of a spiral with inner and outer radii $\displaystyle \mathrm{r}_1$ and $\displaystyle \mathrm{r}_2$ respectively. When a current of strength I is passed through the coil, the magnetic field at its centre will be :
Official answer
(4)
$\displaystyle \frac{\mu_0 \mathrm{nI}}{2\left(\mathrm{r}_2-\mathrm{r}_1\right)} \log _{\mathrm{e}} \frac{\mathrm{r}_2}{\mathrm{r}_1}$
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JEE Main 2022 Physics question, with the answer from NTA’s final answer key. Where our answers come from.