NEET Exam Model Paper 6

As revolving charge is equivalent to a current, so
⇒qf=q×ω But ω=

v

R

where, R is radius of circle and v uniform speed of charged particle.
Therefore, I=

qv

2πR

Now, magnetic moment associated with charged particle is given by
µ=

qv

2πR

×πR2=

1

2

qvR or µ=IA=I×πR2