A parallel-plate transmission line is comprised of two perfect conductors of width w lying in the planes x = 0 and x = d. At z =z1 and the time t, the power flow is 8 kw and the electric and magnetic fields are 5000 V/m and 0.5T. At z =z1 and at the same time t, the power flow is 6 kw and the electric field is 4000 V/m.
What is the magnetic field at z =z2 at the time t?