A circular loop of radius 7 cm is placed in uniform magnetic field of 0.2 T directed perpendicular to plane of loop. The loop is converted into a square loop in 0.5 s. The EMF induced in the loop is 
mV.
Text Solution
Verified by ExpertsThe correct answer is:
B
Circular loop with radius 
in magnetic field 
.
Initial flux through circular loop: 
The loop is converted to a square maintaining the same perimeter: 
Side of square: 
Final flux through square loop: 
Evaluating: 
Change in flux: 
Average EMF: 
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