In your own words, explain why the direction along which the electromagnetic wave travels is not the same as the direction along which the changing magnetic field is applied.

Question

alones · Answer

http://openstudy.com/updates/51e09656e4b0d9a104db7d92

osprey · Answer

An electromagnetic wave is a TRANSVERSE wave. This means that the "bits that are oscillating" do so AT RIGHT ANGLES - ie 90 degrees - to the direction of travel. "the bits that are oscillating are a MAGNETIC FIELD and an ELECTRIC FIELD. These two bits are, in turn, at 90 degrees to each other.
So, to follow this so far, it MAY help to look at your hand. Do a "thumbs up", then stick out the forefinger, and then the finger next to it. If the forefinger represents the direction of the EM field, then the thumb and other finger represent the directions of the magnetic and electric fields. Though which is which is another matter. 

There is at least one other type of wave, which hopefully explains my use of upper case for transverse. That is LONGITUDINAL. Possibly the most common example of a longitudinal wave is the good old SOUND wave. In this wave, "bits that are oscillating" do so ALONG THE LINE OF THE WAVE. Hence the term longitudinal as opposed to transverse.