An electromagnetic wave with frequency 65.0 Hz travels in an insulating magnetic material that has dielectric constant 3.64 and relative permeability 5.18 at that frequency. The electric field has amplitude 7.20 x 10-3 V/m.
a) What is the speed of propagation of the wave?
b) What is the wavelength of the wave?
c) What is the amplitude of the magnetic field?