3 Electromagnetic Waves Electromagnetic Wave Discharging Fleld Spark orVectors O

Question

3 Electromagnetic Waves Electromagnetic Wave Discharging Fleld Spark orVectors Oscillating Molecular Electric Field Vectors Dipole Figure 1 Question 4: (30 points) Representing a wave is more complicated than representing an oscillation, because now you have two variables to deal with: position and time. This figure shows a snapshot of an electro- magnetic wave traveling in the positive z-direction, with the electric field oscillating in the x-direction and the magnetic field oscillating in the y-direction. (This is a gencral property of electromagnetic waves: the electric field, the magnetic field, and the direction of propagation form a right-handed coordinate system.) Since the vectors E and B are perpendicular to each other and to the direction of propagation of the wave, the direction of propagation must be the same as that of E × Bor-E×B a) Examine the figure at a point where E points upwards. Is the direction of propagation the same as that b) Now examine the figure at a point where E points downwards. Is the direction of propagation the same

Explanation / Answer

a) In this case the direction of proagation is E X B

b) In this case the direction of propagation is -E X B

c) The amplitude of the waves in case 2 is double that case 1.

d)

e) In all the three cases the em wave is propagating in E X H direction

f) The em wave is moving itself in the said direction. We can say that the em wave is changing it's position or energy in this direction.

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