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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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2πR4σω

πR4σω

πR42σω

πR44σω

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detailed solution

Correct option is D

M=Q2m.L=σ.πR22m.Iω=πR2σ2m.12mR2.ω

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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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Ready to Test Your Skills?

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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 :