A long solenoid has 500 turns. When a current of 2 amperes is passed through it, the resulting magnetic flux linked with each turn of the solenoid is 4 × 10–3 Wb. The self-inductance of the solenoid is -
1
1.0 henry
2
4.0 henry
3
2.5 henry
4
2.0 henry
5
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