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Q.

The inductance of a solenoid, 0.5 m long of cross-sectional area 20 cm2 and with 500 turns, is

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a

12.5 mH

b

1.25 mH

c

15.0 mH

d

0.12 rnH

answer is B.

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Detailed Solution

L=μ0N2Al=4π×10-7×(500)2×20×10-40.5=1.25mH
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