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Question
An electron revolving in a circular orbit of radius 'r' with velocity 'v' and frequency v has orbital magnetic moment 'M'. If the frequency of revolution is tripled then the new magnetic moment will be ____________.
Options
`"M"/4`
`"M"/3`
3M
M
MCQ
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Solution
An electron revolving in a circular orbit of radius 'r' with velocity 'v' and frequency v has orbital magnetic moment 'M'. If the frequency of revolution is tripled then the new magnetic moment will be 3M.
Explanation:
`"I" = "e"/"T" = "ev and I" prop "v"`
`therefore "M"_"initial"= "IA"`
`therefore "M"_"final" = 3"IA" = 3"M"`
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Origin of Magnetism in Materials
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