Answer to Question #2412 in Electricity and Magnetism for jon allen

Question

A particle of mass 1.2616 × 10−25 kg and
charge of magnitude 3.2 × 10−19 C is acceler-
ated from rest in the plane of the page through
a potential difference of 463 V between two
parallel plates as shown. The particle is in-
jected through a hole in the right-hand plate
into a region of space containing a uniform
magnetic field of magnitude 0.269 T oriented
perpendicular to the plane of the page. The
particle curves in a semicircular path and
strikes a detector.What is the speed of the charged particle as
it enters the region of the magnetic field?
Answer in units of m/s.