Question

At a given instant time, a traveling EM wave is noted to have its maximum magnetic field pointing west and its maximum electric field pointing south.

Part A

In which direction is the wave traveling? North- Downward-South-Upward-West or East?

Part B

If the rate of energy flow is 530 W/m^2, what are the maximum values for the two fields?

Part C

Answer 1

Answer A: Downward.The direction of magnetic field , electric field and the direction of propagation , all three are perpendicular to each other. So it would be downward. That is if west is -x and south is -y then doward is -z.

Answer B.:

S = EB/(?₀) = E²/(?₀c)

S =  530 W/m^2

?₀ = 4?*10^-7 N/A²

c = 3*10⁸ m/s

530 = E²/(?₀c)

On solving above by substituting values :

E = 446.99 N/C

Also,

B = E/c

Substituting E = 446.99 in above equation we get,

B = 148. 99 * 10^-8 B