The self inductance of a long solenoid cannot be increased by

Options

A. increasing its area of cross section
B. increasing its length
C. increasing the current through it
D. increasing the number of turns in it

Answer

C

Explanation

The self inductance of a long solenoid is given by
`L = mu_r mu_0 n^2 Al`
where, n = Number of turns per unit length
l = Length
A = Cross-sectional area
`mu_r` = Relative permeability of the medium
From the given expression it is clear that the self inductance of a long solenoid does not depend upon the current flowing through it.