Question

1. An electron gun fires 10,000 electrons per second along the z-axis at 100 m/s. Find the magnetic field vector in polar coordinates 1 cm laterally from the beam, very far from its source such that the beam's length can be treated as infinite. The charge of the electron is -1.6×10-19 C, and the permeability of free space is 4π×10-7 T·m/A.

Answer 1