There are two long co -axial solenoids of same length $l.$ The inner and outer coils have radii $r_1$ and $r_2$ and number of turns per unit length $n_1$ and $n_2$ respectively. The ratio of mutual inductance to the self -inductance of the inner -coil is
There are two long co -axial solenoids of same length $l.$ The inner and outer coils have radii $r_1$ and $r_2$ and number of turns per unit length $n_1$ and $n_2$ respectively. The ratio of mutual inductance to the self -inductance of the inner -coil is
- [JEE MAIN 2019]
- A
$\frac{{{n_1}}}{{{n_2}}}$
- B
$\frac{{{n_2}}}{{{n_1}}}.\frac{{{r_1}}}{{{r_2}}}$
- C
$\frac{{{n_2}}}{{{n_1}}}.\frac{{r_2^2}}{{r_1^2}}$
- D
$\frac{{{n_2}}}{{{n_1}}}$
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