Question

If N is the number of turns in a coil, the value of self inductance varies as

• A. $N^0$
• B. N
• C. $N^2$
• D. $N^{-2}$

Answer 1

Answer: (C)

$N^2$

Answer 2

$L=\frac{N\phi}{i}; \phi=BA; B=\mu_0ni=\frac{\mu_0 Ni}{l}$
$L=\frac{\mu_0N^2}{l}A=\mu n^2 \, \, A \, l$
where n is the number of tums/unit length $L? N^2$