magnetic field question?

Question

aln elctron is moving 5x10^6 m/s parallel to a 1mm diameter wire carrying a current of 20 A. If the elctron is 2 mm from the center of the wire, w/ its velocity in the same direction as the current. what is the force that the electron experiences?

i know that F= qVB

and B= (U I) / (2 pi r)

but i duno....plz help

Answer 1

You need to know what all the parameters mean.V = velocity and you have that. I is current, 20 amps. B is the field. r is the radius, 2mm. I am not sure what U is. I believe q is the charge of the electron. You need to watch the units. good luck