Figure 4(a) below shows cross sections of two long straight wires; the left-hand wire carries current i, directly out of the page. If the net magnetic field due to the two currents is to be zero at point P, (a) should the direction of current iz in the right-hand wire be directly into or out of the page and (b) should iz be greater than, less than, or equal to i1? 01 P Fig. 4(a)

Figure 4(a) below shows cross sections of two long straight wires; the left-hand wire carries current i, directly out of the page. If the net magnetic field due to the two currents is to be zero at point P, (a) should the direction of current iz in the right-hand wire be directly into or out of the page and (b) should iz be greater than, less than, or equal to i1? 01 P Fig. 4(a)