A proton is moving in a uniform magnetic field B in a circular path of radius a in a direction perpendicular to Z- axis along which field B exists. Calculate the angular momentum. If the radius is a and charge on proton is e.
A. `(Be)/(a^(2))`
B. `eB^(2)a`
C. `a^(2) eB`
D. `aeB`
