A proton is moving in a uniform magnetic...

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.

`(Be)/(a^(2))`

`eB^(2)a`

`a^(2) eB`

`aeB`

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