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The self inductance L of a solenoid of l...

The self inductance L of a solenoid of length l and area of cross-section A, with a fixed number of turns N increases as

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The correct Answer is:
b
The self inductance L of a solenoid of length l and area of cross section A with fixed number of turns N is
`L=(mu_(0)N^(2)A)/(l)`
So, L increases when l decreases and A increases
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