A graph of magnetic flux $\phi$ versus current (I) is shown for four inductors $\mathrm{A}, \mathrm{B}$, C,…
A graph of magnetic flux $\phi$ versus current (I) is shown for four inductors $\mathrm{A}, \mathrm{B}$, C, D. Smaller value of self inductance is for inductor
A
C
B
D
Solution
We have $\phi=\mathrm{LI} \quad$ or $\quad \mathrm{L}=\frac{\phi}{\mathrm{I}}$
self-inductance is given by the slope of the graph. Slope of line $A$ is maximum, hence it gives maximum value of self inductance.