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Q.

An ideal solenoid of cross sectional area 10-4m2 has 500 turns per metre. At the centre of this solenoid, another coil of 100 turns is wrapped closely around it. If the
current in the coil changes from 0 to 2A in 3.14 ms, the emf developed in the second coil is

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a

1 mV

b

3 mV

c

2 mV

d

4 mV

answer is D.

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Detailed Solution

M=μN1N2l.Ae=MΔiΔt=4π×10−7×500×100×10−41×23.14×10−3=40×10−7=4×10−3v=4mV

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