A flexible wire, bent in the form of a circle, is placed in a uniform magnetic field, perpendicular to the plane of the coil. The radius of the coil changes with time as shown in the figure. The induced emf in the coil is
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
B
i.e., 
for 
for 
constant 
for 
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