(a) An em wave is traveling in a medium with a velocity . Draw a sketch showing the propagation of the em wave, indicating the direction of the oscillating electric and magnetic fields.
(b) How are the magnitudes of the electric and magnetic fields related to the velocity of the em wave?

Solution

E with rightwards harpoon with barb upwards on top cross times B with rightwards harpoon with barb upwards on top

represents the direction of propagation of wave. The figure below shows us the propagation of the em wave.

a) The direction of oscillating field is

straight i with hat on top space equals space j with hat on top space cross times k with hat on top

b) Speed of EM wave is given by |c| =

straight E subscript straight o over straight B subscript straight o

; E_o is the magnitude of electric field and is the magnitude of magnetic field.

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