A plane electromagnetic wave traveling in the positive direction of an x axis in vacuum has components Ex= Ey = 0 and Ez = (2.0 V/m) cos[(π × 1015 s−1)(t − x/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?

The direction of the magnetic field component will be in the negative direction of y.

Explanation:

The  propagate direction of the wave if given by the cross product between E and B.

Now, if the direction of the propagate wave is in the positive x axis (+x) and the direction of the electric field component is in the positive direction of the z axis. We will have:

If we use the right hand rule we will have that the direction is -y.

Therefore the direction of the magnetic field component will be in the negative direction of y.

I hope it helps you!

that tool is called an altimeter which measures your altitude which can be used to tell which atmosphere you are currently in, including the stratosphere.

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