For the electromagnetic wave propagating in the +z direction from problem #1, as

Question

For the electromagnetic wave propagating in the +z direction from problem #1, assume that the magnetic fields' directions are along the x-axis (positive values of 13 arc along the positive z-axis and vice versa). (a.) What direction is the wave's electric fields? Explain how you determined your answer. (b.) For the z = 0 location, sketch both the electric and magnetic field vectors for the indicated times. Draw the peak electric and magnetic field vectors to be two units long. Explain how you determined what to draw.

Explanation / Answer

(a)

let the unit vector for direction of magnetic field be i

unit vector for direction of electromagnetic wave be k

therefore unit vector for direction of electric field = i x k = -j

therefore direction of electric field = negative y axis

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