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Question

A magnetic field of 2×102 T acts at right angles to a coil of area 100 cm2, with 50 turns. The average e.m.f. induced in the coil is 0.1 V, when it is removed from the field in t sec. The value of t is
  1. 10s
  2. 0.1 s
  3. 0.01 s
  4. 10 s


Solution

The correct option is B 0.1 s
By Lenz's law,
e=(ϕ2ϕ1)tϕ2=0, as no field lines will pass through the coil after time t=(0NBA)t=NBAtSo, t= NBAe= 50×2×102×1020.1=0.1 s

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