For part C) Sourcelin the figure emits electromagnetic radiation of 15 MHz Sourc

Question

For part C)

Sourcelin the figure emits electromagnetic radiation of 15 MHz Source 1 in every direction. The radiation is detected at point Plocated 40m away from the source. At P the wave delivers an average of 4 x 104W of power on a small square of 1cm2. (a At point P, calculate the amplitudes of the electric and magnetic field. m P A second source is added 30m away from the first one, to the line between Source 1 and point P, as the figure shows (b) Find the phase difference between the two waves at point P. Determine whether constructive, partial or destructive interference occurs at point P. Source 2

Explanation / Answer

a) s=ExB/muo. B=E/C for em radiation. so, Power/area = E^2/2cmuo avg. Which gives E=7.7x10^5 N/c and B=2.53x10^-3T.
b)a=40cm and b=30cm so c=50cm (triangle lenghts). wavelength=c/frequency. for15Mhz, lambda=20m. (.50-.40)/20=0.005. Phase=pi/100.
c)

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