JEE Main 2019 — Physics solution | Fundamenthol

JEE Main2019Physics

Q.

There are two long co-axial solenoids of same length l. The inner and outer coils have radii r₁ and r₂ and number of turns per unit length n₁ and n₂, respectively. The ratio of mutual inductance to the self inductance of the inner-coil is.

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
$\frac{n _{1}}{n _{2}}$

Solution

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