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Q.

A short solenoid of length 4cm, radius 2cm and 100 turns is placed inside and on the axis of a long solenoid of length 80cm and 1500 turns, a current of 3A flows through the short solenoid. The mutual inductance of two solenoid is

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a

3.52×10−3H

b

2.96×10−4H

c

5.3×10−5H

d

8.3×10−5H

answer is A.

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Detailed Solution

M=μ0n1n2Al=4π×10−7(1004×10−2)(150080×10−2)(π×4×10−4)(4×10−2)=0.120H

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