ElectroMagnetic InductionHard
Question
A rectangular loop of sides of length l and b is placed in x-y plane. A uniform but time varying magnetic field of strength 
= 20 tî + 10 t2 ĵ + 50
where t is time elapsed. The magnitude of induced e.m.f. at time t is:
= 20 tî + 10 t2 ĵ + 50 where t is time elapsed. The magnitude of induced e.m.f. at time t is:Options
A.20 + 20 t
B.20
C.20 t
D.zero
Solution
The area vector of loop 
= ± 1 b 
&
= 20 t î + 10x2ĵ + 50
∴ Magnetic flux is φ =
.
= ± 50 1b
∴ emf =
= 0
= ± 1 b &
= 20 t î + 10x2ĵ + 50∴ Magnetic flux is φ =
. = ± 50 1b∴ emf =
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