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A charged particle of mass m and charge ...

A charged particle of mass m and charge q describes circular motion of radius r in a uniform magnetic field of strength B. The frequency of revolution is

A

`(3Bq)/(2pim)`

B

`(3Bq)/(2pim)`

C

`(2pim)/(2Bq)`

D

`(Bq)/(2pim)`

Text Solution

Verified by Experts

The correct Answer is:
D
For coil circumference `L=2pir`
`:.r=(L)/(2pi)`
Area of coil `=pir^(2)=pi((L)/(2pi))^(2)=(L^(2))/(4pi)`
Magnetic momet =lA
`implies` Magnetic moment `=(lL^(2))/(4pi)`
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