A vertical disc of diameter 10 cm makes 20 revolutions per second about a horizontal axis passing through its center. A uniform magnetic field 
acts perpendicular to the plane of the disc. Calculate the potential difference between its centre and rim (in volts).
Text Solution
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As, we know, disc is equivalent to a rod of length 
. Divide disc into rods, each rod can be replaced by a battery and these batteries would be parallel in arrangement.
According to the question, radius of disc,
Angular velocity, 
Magnetic field, 
The emf of a disc is given as
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