A -4.80-C charge is moving at a constant speed of 6.80 X 105 m/s in the +x-direction relative to a reference frame. At the instant

A -4.80-μC charge is moving at a constant speed of 6.80 X 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 = 0.500 m. y = 0. z = 0;
(b) x = 0, y = 0.500 m. z = 0;
(c) x = 0.500m. y = 0.500m, z = 0;
(d) x = 0. y = 0. z = 0.500m?