An electron moves along the z-axis...?

An electron moves along the z-axis with vz=5.0*10^7 m/s. As it passes the origin, what are the strength and direction of the magnetic field at the following
a) (2cm, 0cm,0cm)
b) (0cm, 0cm, 2cm)
c) (0cm, 2cm, 2cm)
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