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Q.

 A non-conducting disk of radius R is rotating about its own axis with constant angular velocity ω in a perpendicular uniform magnetic field as shown in figure. The emf induced between centre and rim of disk is

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a

BωR23

b

BωR2

c

BωR22

d

Zero

answer is C.

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Detailed Solution

As the ring is non-conducting, no motion of charge carriers occur and hence there is no induced emf 

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 A non-conducting disk of radius R is rotating about its own axis with constant angular velocity ω in a perpendicular uniform magnetic field as shown in figure. The emf induced between centre and rim of disk is