A pulse of electromagnetic radiation is propagating in the -y direction. You hav

Question

A pulse of electromagnetic radiation is propagating in the -y direction. You have two devices that can detect electric and magnetic fields. You place detector #1 at location < 0, 4, 0> m and detector #2 at location < 0, -4, 0> m.

(a) At time t = 0, detector #1 detects an electric field in the -x direction. At that instant, what is the direction of the magnetic field at the location of detector #1?
---Select--- +x -x +y -y +z -z B=0
(b) At what time will detector #2 detect electric and magnetic fields?
t =  s

Explanation / Answer

a) -z

b) v=d/t (solve for t)
you know a field is detected at 4m and you need to find when a field will be detected at -4m, so the distance is 6m, and electromagnetic waves propagate at the speed of light 2.8x10^8, so...
t=8/3e8

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