The self inductance of a long solenoid cannot be increased by

Options

A. increasing its area of cross-section
B. increasing its length
C. changing the medium with greater permeability
D. increasing the current through it

Answer

D

Explanation

The self inductance of a long solenoid
`L=(muN^(2)A)/(l)`
i.e., the self inductance of a long solenoid caanot be increased by increasing the current through it.