An electromagnetism wave is traveling in vacuum along thehorizontal or x-axis. I

Question

An electromagnetism wave is traveling in vacuum along thehorizontal or x-axis. It consists of an electric field of peakstrength 2.1x10-5 Vm-1 in the verticaldirection or z-axis and a magnetic field.

a) What is its speed v?

b) What is the peak strength of the magnetic fied component?

c) If the E were momentarily vertical (+z) and the vertical is inthe +x direction, what direction is B at that instant?

d
0 What are the direction of E,B and v one half period later?

e) What us the magnitude of the associated Poynting vector?

Explanation / Answer

electric field of peak strength e = 2.1x10-5 Vm-1 Speed of wave v = 3 * 10 ^ 8 m / s (b). peak value of magnetic field B = E / v                                                      =0.7 * 10 ^ -13 T (c). vertically y direction Poynting vector = E X H where H = B / = permeability of free space = 4* 10 ^ -7 H /m Speed of wave v = 3 * 10 ^ 8 m / s (b). peak value of magnetic field B = E / v                                                      =0.7 * 10 ^ -13 T (c). vertically y direction Poynting vector = E X H where H = B / = permeability of free space = 4* 10 ^ -7 H /m

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