Sample problem: Current loop

Consider a square current loop which carries a current of 1 A in a clockwise direction. Consider the loop to lie in the x-y plane joining the (x,y) vertices (-1,-1), (1,-1), (1,1), (-1,1). Find the three components of the magnetic field on the z-axis. Plot the magnitude of any non-zero components of $\vec{B}$ as a function of z