[5.] (20 pts) Two circular coils of radius R, each with N turns, are perpendicular to the x-axis. The coil centers are a distance R apart. Each coil carries a steady current / in the same direction as shown. R R R- (a) Find an expression for the magnetic field B at the point P, where P is between the coils at a distance x from the center of one coil. (b) Repeat (a) if P is located at the midpoint between the two coils