An H field in free space is given as Hx t 10 cos 108 t bet

An H field in free space is given as H(x, t) = 10 cos (10^8 t - beta x)a_y A/m. Find the beta and the wavelength lambda. 0.33 rad/m and 18.9 m Cannot be determined since beta is a Variable 10^8 rad/m and 10^8 m 3 times 10^8 rad/m and 0.33 m A

Solution

(4)

beta=omega/c=10^8/3.08*10^8=0.33 rad/s

only one option matches this value so option A is correct