At the instant when the point charge is at the origin of

Question

A +5.00 μC point charge is moving at a constant 8.50 x 10⁶m/s in the +y-direction, relative to a reference frame. At the instant when the point charge is at the origin of this reference frame, what is the magnetic-field vector B^→- it produces at the following points.

Part A
x=0.500m, y=0, z=0

Part B
x=0, y=-0.500 m, z=0

Part C
x=0, y=0, z=+0.500m

Part D

x=0, y=-0.500m, z=+0.500m