If the particle in Problem 30 is an electron instead of a proton, what is the radius o...

If the particle in Problem 30 is an electron instead of a proton, what is the radius of the trajectory?

(reference problem 30)

A proton has an initial velocity when it enters a region in which is parallel to the z direction (Fig. P20.28). (a) Show that the proton will move in a circle that lies in the x–y plane. (b) If and B = 0.80 T, what is the radius of this circle?