UPSEE 2019 Solved Paper

An electron moving in a circular motion is shown in figure belowCurrent due to circular motion
i=

e

t

, where t= time period
So, the magnetic moment of electron
m=i.A=

e

T

.πr2
⇒m=er2

2π

2T

=

eωr2

2

[∵

2π

t

=ω]
⇒m=

evr

2

[∵ω=

v

r

]
Hence, the correct option is (b).