The self inductance of a long solenoid cannot be increased by

Options

A. increasing its area of corss section
B. decreasing 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_(0)N^(2))/(l)`
where
N=muber of turns
l = Length
A= Cross-sectional area
From the above expression it is clear that the self inductance of a long the solenoid does not depend upon the current flowing through it.