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Question

Write the expression for the equivalent magnetic moment of a planer current loop of area A. having N turns and carrying a current i. Use the expression to find the magnetic dipole moment of a revolving electron.

Solution
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for a revolviing electron.for 1 revolution number of terms=1i=et=eV2πRM=iNA=eV2πR×1×πR2=eVR2we get, eVR2

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