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A source in vacuum emits electromagnetic radiation in every direction. At a point P, located 40m away from the source the electric field is E (z,t) = 10V/m Ã®cos(kz+ 1.6Ã-10^7 radians/s t).

a) Determine the direction of energy transfer at point P.

b) Calculate the frequency and wavelength of this wave.

c) Write down the magnetic field (vector) as a function of position and time only, at point P.

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