A long, straight wire lies on a horizontal table in the xy-plane and carries a current of 5.60 A in the positive x-direction along the

A long, straight wire lies on a horizontal table in the xy-plane and carries a current of 5.60 μA in the positive x-direction along the x-axis. A proton is traveling in the negative x-direction at speed 4.5 × 104 m/s a distance d above the wire (i.e. z = d). 

(a) What is the direction of the magnetic field of the wire at the position of the proton? 

(b) What is the direction of the magnetic force acting on the proton?