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Q.

A thin circular disk of radius R is uniformly charged with density σ>0 per unit area. The disk rotates about its axis with a uniform angular speed ω. The magnetic moment of the disc is :

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a

2πR4σω

b

πR4σω

c

πR42σω

d

πR44σω

answer is D.

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Detailed Solution

M=Q2m.L=σ.πR22m.Iω=πR2σ2m.12mR2.ω
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