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Q.

A magnetic field of 2×10−2T acts at right angles to a coil of area 100 cm2 with 50 turns.  If the average emf induced in the coil is 0.1 V when it is removed from the field in time t. The value of ‘t’ is

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a

0.1 s

b

0.01 s

c

1 s

d

20 s

answer is A.

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Detailed Solution

B=2×10−2T A=100cm2=100×10−4m2 N=50, e=0.1Ve=dϕdt=(ϕ2−ϕ1)tCoil is removed from the field ⇒ϕ2=0e=ϕ1t=BANtt=BANe=2×10−2×10−2×500.1=0.1 s
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