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A proton is initially at rest accelerates through a
potential difference V and enters into a region 0<x<d, where
m, q
there is a uniform magnetic field of magnitude B with direction perpendicular to the plane of the
paper and inward. (Gravitational force on the proton is negligible.)
(a) What will be the velocity of the proton as it enters the magnetic field at x=0?
(b) In which direction (+J or –f) will the proton be deflected in the region x>0, and what will be
its trajectory? Explain why.
(c) What is the radius of the circular trajectory of the proton?

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