There are two long co-axial solenoids of same length | EMI

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JEE MAIN 2019

11-01-2019 S1

Question

There are two long co-axial solenoids of same length I . The inner and outer coils have radii $\mathrm{r}_1$ and $\mathrm{r}_2$ and number of turns per unit length $n_1$ and $n_2$, respectively. The ratio of mutual inductance to the self inductance of the innercoil is

Select the correct option:

A

$\frac{n_2}{n_1} \cdot \frac{r_2^2}{r_1^2}$

B

$\frac{n_2}{n_1}$

C

$\frac{n_2}{n_1} \cdot \frac{r_1}{r_2}$

D

$\frac{n_1}{n_2}$

✓ Correct! Well done.

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Solution

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