Published by:
CGP EDU Academic Team
Published on: September 12, 2026
A conducting circular loop is placed in a uniform magnetic field 
with its plane perpendicular to the field. Somehow, the radius of the loop starts shrinking at a constant rate of 1.0 mm 
. Find the approximate induced emf in the loop at an instant when the radius is 2 cm.
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
A
Let the radius be r at time t. The flux of the magnetic field at this instant is 
Thus, 
The induced emf when 
is
Therefore, 
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