A pane electromagnetic wave traveling in the pos e drect on of an x aos n vacuum

Question

A pane electromagnetic wave traveling in the pos e drect on of an x aos n vacuum has com ponents Ex E and E: .SV m cos a 1 ss -o , what s e ampitude ofthe magnetic ei component? Parallel to which axis does the magnetic field oscilate? (c) When the electric field component is in the positive direction of the z axis at a certain point P, what is the direction of the magnetic field component there? Assume that the speed of light is 2.998*108 m/s. (a) Number Units Te: -y +/-2% Question Attempts: o of 10 used SAVE FOR LATER SUBHIT ANSWER

Explanation / Answer

(a) Eo = 4.5 V/m

mabnetic field amplitude Bo = Eo/c

Bo = 4.5/(3x108)

Bo = 1.5 x 10-8 T

(b) Wave is travelling along x direction

and Electric field is oscillating along z direction

so magnetic field will oscillate along y direction

(c) We can use right hand rule to find out the resultant vector

here resultnat is the direction of wave motion

as electric field is along +z direction so magnetic field will be along -y direction

to give resultant along x direction

so here direction of magnetic field component will be along -y axis

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