1.

An electron is moving in an orbit of radius R with a time period T as shown in the figure. The magnetic moment produced may be given by |e| represents the magnitude of the election charge.

Answer»

`vecm = (2PI|e|vecA)/T`
`vecm = - (2pi|e|vecA)/T`
`vecm = - (|e|vecA)/T`
`vecm = - (|e|vecA)/T`

Solution :Magnitude of MAGNETIC moment = i.A
Charges crossing a point per second `= ev = e(2pi)/T`
`therefore` Magnetic moment `(2pi)/T|e|overlineA`
As the ELECTRON is flowing is the anticlockwise DIRECTION, the CUMENT is flowing in the clockwise direction.
`therefore overlinew = - (2pi)/T|e|overlineA`


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