Question
Consider each of the electric- and magnetic-field orientations. What is the direction of propagation or the wave if E = Ei, B = -Bj. Express the direction of the propagation vector, P, as a unit vector. Its three components should be entered in order (x, y, z) separated by commas. For example, if the wave propagates only in the -x direction, enter -1, 0, 0. What is the direction of propagation of the wave if E = Ej, B = Bi Express the direction of the propagation vector, P, as a unit vector. Its three components should be entered in order (x, y, z) separated by commas. For example, if the wave propagates only in the -x direction, enter -1, 0, 0.
Explanation / Answer
From the given question,
The direction of propagation vector is E x B
part A
E = Ei
B= -Bj
E x B=(Ei x -Bj)
= -EB k
propagation vector is (0,0,-1)
part B
E = Ej
B= Bi
E x B=(Ej x Bi)
= -EB k
propagation vector is (0,0,-1)