Question: Q. 3. (i) Define the term ‘self-inductance’ and write its
S.I. unit.
(ii) Obtain the expression for the mutual inductance of two long co-axial solenoids $S_{1}$ and $S_{2}$ wound one over the other, each of length $L$ and radii $r_{1}$ and $r_{2}$ and $n_{1}$ and $n_{2}$, number of turns per unitlength, when a current $I$ is set up in the outer solenoid $S_{2}$.
R [Delhi I, II, III 2017]
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Solution:
Ans. (i) Try yourself, Similar to Q. 2 (a), Short Answer Type Questions-I.
The S.I. unit of self-inductance is Henry $(\mathrm{H})$. 111/2
(ii) Try yourself, Similar to Q. 1 (ii), Short Answer Type Questions-II
