CBSE 2025 · Region 2 · Set 2 · Q5 · 1 mark
Two long solenoids of radii $\displaystyle \mathrm{r}_{1}$ and $\displaystyle \mathrm{r}_{2}\left(>\mathrm{r}_{1}\right)$ and number of turns per unit length $\displaystyle \mathrm{n}_{1}$ and $\displaystyle \mathrm{n}_{2}$ respectively are co-axially wrapped one over the other. The ratio of self-inductance of inner solenoid to their mutual inductance is-
Official answer
From CBSE’s own marking scheme for this paper.
(A)
$\displaystyle \frac{\mathrm{n}_{1}}{\mathrm{n}_{2}}$
Electromagnetic InductionInductanceApplymcqmedium
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CBSE Class 12 Physics past-paper question from the 2025board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.