Question: A proton has an initial velocity v S B when it enters a region in which B A (vector) proton has an initial velocity is

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

VA, 45°

VA, 45

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