Source 1 in the figure emits electromagnetic radiation of 15 MHz Source 1 in eve

Question

Source 1 in the figure emits electromagnetic radiation of 15 MHz Source 1 in every direction. The radiation is detected at point P located 40 m 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. Source 1 O 40 m P A second source is added 30m away from the first one, perpendicular to the line between Source 1 and point P, as the figure shows. 30 m (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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