13. We assume the current flows in the +xdirection and the particle is at some distance din the +ydirection (away from the wire). Then, the magnetic field at the location of a proton with charge qis0ˆ(/2)k.Bidµπ=GThus, GGGGFqvBiqdv=×=×µ02π±.kejIn this situation, Gvv=−±jej(where vis the speed and is a positive value), and
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