A copper disc of radius 
rotates about an axis passing through its centre and perpendicular to its plane with 10 revolutions per second in a uniform transverse magnetic field of 
. The emf induced across the radius of the disc is
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
C
Consider a small radial segment of 
at a distance from the centre of the disc.
Velocity of this segment, 
emf induced across this segment
Total emf induced across radius of disc 
.
Here, 
revolution 
.
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