A particle of charge q and mass m is moving with constant speed v and perpendicular to a constant magnetic field B follows circular path. If the angular momentum about the center of this circle is quantized so that mvr =n, `h/(2pi)`,then the allowed radii forthe particle are given by

Options

A. `r_(s)^(2) = (nh)/(2pi qB)`
B. `r_(n)^(2) = (nhq)/(2piB)`
C. `r_(s)^(2) = (nhB)/(2pi q)`
D. `r_(s)^(2) = (2pi nh)/(Bq)`

Answer

A