A conducting circular loop is placed in a uniform magnetic field of 0.4 T with its plane perpendicular to the field. Somehow, the radius of the loop starts expanding at a constant rate of 1 mm s -1 . The magnitude of induced emf in the loop at an instant when the radius of the loop is 2 cm will be_______ 
V.
Text Solution
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(50)
The data given is
B = 0.4T
R = 2 x 10 -2 m
It is given that 
= 10 -3 m s -1
Area of the loop is A = 
R 2
So, 
The flux is,
So, the magnitude of emf is
= 5.028 x 10 -5 V
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