A charge q is spread uniformly over an insulated loop of radius r. If it is rotated with an angular velocity $\omega $ with resect to normal axis then the magnetic moment of the loop is :
q $\omega $r2
${4 \over 3}$ q $\omega $r2
${3 \over 2}$ q $\omega $r2
${1 \over 2}$ q $\omega $r2
Solution
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