Two long solenoids of radii r_ 1 and r_ 2 ( r_ 1 ) and number of turns per unit length n…
Physics · Class 12 · CBSE — Electromagnetic Induction
Two long solenoids of radii \(r_{1}\) and \(r_{2}\left( \gt r_{1}\right)\) and number of turns per unit length \({n}_{1}\) and \({n}_{2}\) respectively are co-axially wrapped one over the other. The ratio of self-inductance of inner solenoid to their mutual inductance is-
- \(\frac{{n}_{1}}{{n}_{2}}\)
- \(\frac{{n}_{2}}{{n}_{1}}\)
- \(\frac{n_{1} r_{1}^{2}}{n_{2} r_{2}^{2}}\)
- \(\frac{{n}_{2} {r}_{1}^{2}}{{n}_{1} {r}_{2}^{2}}\)
Answer
(A) n _ 1 n _ 2
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