A uniform plane wave is traveling in the x direction in air with its magnetic field oriented in the z direction. At the instant t 0, the wave magnetic field has two adjacent zero values, observed at locations x = 2.5 cm and x = 7.5 cm, with a maximum value of 70 mA/m at x = 5 cm. (a) Find the wave magnetic field H(x,t) and its phasor H(x). (b) Find the corresponding wave electric field E(x, t) and its phasor E(x).