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Q.

If a coil of 40 turns and area 4.0 cm2 is suddenly removed from a magnetic field, it is observed that a charge of 0.2mC flows into the coil. If the resistance of the coil is 80 Ω, the magnetic flux  density in Wb/m2 is

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a

0.5

b

1.0

c

1.5

d

2.0

answer is B.

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Detailed Solution

n=40,A=4cm2=4×10−4m2 q=2×10-4 C R=80Ωq=BANR⇒B=qRANB=2×10−4×804×10−4×40=1Wb/m2
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