A conducting circular loop is placed in a uniform magnetic field 0.04 T with its plane perpendicular to the magnetic field. The radius of the loop starts shrinking at 
. The induced emf in the loop when the radius is 2 cm is
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
A
According to faraday’s second law of electromagnetic induction the induced emf is given by rate of change of magnetic flux linked with the circuit.
Here, B = 0.04 T and 
= 2mms -1
induced emf, e = 
= 
= –B 
= –Bπ2r 
Now, if r = 2 cm
e = –0.04 × π × 2 × 2 × 10 -2 × (–2 × 10 -3 )
= 3.2 πµV
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