A straight conductor is carrying electric current along west.  The direction of Magnetic field due to the conductor at a point above the conductor is

according to Biot -Savart law the direction of magnetic field is along (i dl⇀ x r⇀) here idl is along west (assuming -i^  ) and  r is vertically up (assuming along k^)  then direction of B is -i ^x k^ =j^    i.e along north direction