Question: Q. 8. (i) Define self-inductance of a coil and hence write the definition of ‘Henry’.
(ii) Write any two factors each on which the following depends :
(a) Self-inductance of a coil.
(b) Mutual inductance of a pair of coils.
R $\mathrm{U}$ [Foreign 2016]
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Solution:
Ans. (i) The self inductance, $L$, of a coil equals the magnetic flux linked with it, when a unit current flows through it.
One henry is the self inductance of a coil which the magnetic flux, linked with it, due to a current of $1 \mathrm{~A}$, flowing in it, equals one weber.
$1 / 2$ [NOTE : Also accept these two definitions based on $\left.\varepsilon=-L \frac{d I}{d t}\right]$
(ii) (a) Self inductance of a coil depends on $1 / 2+1 / 2$
(a) Its geometry (area and length of a coil)
(b) Number of turns
(c) Number of turns in each coil.
(d) Nature of medium in the intervening space.
(Any two)
(b) Mutual inductance of a given pair of coils depends on
(a) Their geometrie
(b) Their distance of separation
(c) Number of turns in each coil.
(d) Nature of medium in the intervening space.
(Any two)
[CBSE Marking Scheme 2016]
