A -4.60 μC charge is moving at a constant speed of
6.90×105 m/s in the +x−direction relative to a
reference frame. At the instant when the point charge is at the
origin, what is the magnetic-field vector it produces at the
following points.
a. x=0.500m,y=0, z=0
b. x=0, y=0.500m, z=0
c. x=0.500m, y=0.500m, z=0
d. x=0, y=0, z=0.500m