A proton has an initial velocity v S B when it enters a region in which B

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A proton has an initial velocity v S B when it enters a region in which BA(vector) proton has an initial velocity 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 v= 500 m/s and B = 0.80 T, what is the radius of this circle? 

VA, 45°


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