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Q.

A uniform magnetic field of 0.4 T acts perpendicular to a circular copper disc 20 cm in radius. The disc is having a uniform angular velocity of 10 π rad s–1 about an axis through its centre and perpendicular to the disc. What is the protential difference developed between the axis of the disc and the rim ? (π = 3.14) 

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a

0.0628 V

b

0.5024 V 

c

0.2512 V 

d

0.1256 V

answer is C.

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Detailed Solution

B = 0.4 T 
r = 20 cm 
ω = 10π rad/s
E=12BωR2=0.2512V

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