A uniform but time-varying magnetic field 
exists in a cylindrical region of radius a and is directed into the plane of the paper as shown in figure. The magnitude of the induced electric field at point P at a distance r from the center of the circular region
A
is zero
B
decreases as 
C
increases as r
D
decreases as 
Text Solution
Verified by ExpertsThe correct answer is:
B
Draw a concentric circle of radius r. The induced electric field E at any point on the circle is equal to that at P.
For this circle, induced emf,
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