ElectroMagnetic InductionHard
Question
A copper disc of radius 0.1m rotated about its centre with 10 revolutions per second in uniform magnetic field of 0.1 Tesla with its plane perpendicular field then emf induced across the radius of the disc is :-
Options
A.
volt
voltB.
volt
voltC.π × 10-2 volt
D.2π × 10-2 volt
Solution
emf across Radius = 
Bωr2 = B2πfr2
= Bπfr2
= 0.1 × π × 10 ×(0.1)2
= π × 10-2 volt.
Bωr2 = B2πfr2= Bπfr2
= 0.1 × π × 10 ×(0.1)2
= π × 10-2 volt.
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