First slide
Faraday's law of Electromagnetic induction
Question

In a magnetic field of 0.05 T, area of a coil changes from 101 cm2 to 100 cm2 without changing the resistance which is 2 Ω. The amount of charge that flow during this period is

Moderate
Solution

ϕ=BA

Change in flux, φ=BA=0.05(101100)104 Wb = 5×106 Wb 

Now, charge, Q=φR=5×1062 C=2.5×106 C

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