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  4. The self inductance of a long solenoid cannot be increased by

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Q. The self inductance of a long solenoid cannot be increased by

KEAMKEAM 2012Electromagnetic Induction

Solution:

The self inductance of a long solenoid
$L=\frac{\mu N^{2} A}{l}$
i.e., the self inductance of a long solenoid cannot be increased by increasing the current through it.