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  • A non-conducting disc of radius R charged uniformly over one side with surface charge density σ rotate about its geometrical axis with an angular velocity <img alt="\omega" src="https://entra

A non-conducting disc of radius R charged uniformly over one side with surface charge density σ rotate about its geometrical axis with an angular velocity \omega. The magnetic moment of the disc is
 

 

Option: 1

\frac{\omega \pi \sigma R^{4} }{3}


Option: 2

\frac{\omega \pi \sigma R^{4} }{4}


Option: 3

\frac{\omega \pi \sigma R^{4} }{2}

 


Option: 4

\omega \pi \sigma R^{4}


Answers (1)

best_answer

Answer (2)

M=\frac{qL}{2m}

L=\frac{mR^{2}}{2}\omega

M=\frac{q}{2m}\times\frac{mR^{2}}{2}\omega

       =\frac{qR^{2}\omega }{4}

Posted by

seema garhwal

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