Question

At a given instant time, a traveling EM wave is noted to have its maximum magnetic...

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


Homework Answers

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

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