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Q.

In the figure, a 120 -turn coil of radius 5 cm and resistance 3.6 Ω is wrapped around a long solenoid of 250 turns cm−1 and diameter 4 cm. The axis of the coil and the axis of the solenoid make angle of 30o with each other. The solenoid current drops from 1.5 A to zero in time interval t = 25 ms. Find the total charge that flows through the coil. Take π2≈10.

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a

2×10−3C

b

4×10−3C

c

23×10−3C

d

3×10−3C

answer is D.

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Detailed Solution

Change in flux (linked)ΔΦ=120×μ0ni.π21002cos300Charge that flows through coil=ΔΦR,R=3.6Ω
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