An electromagnetic wave is traveling in a vacuum. The electric field E of the wave is doubled. What happens to the magnetic field B, the total energy density u, and the intensity S of the wave?
- B doubles, u doubles, S doubles
- B doubles, u increases by a factor of four, S increases by a factor of four
- B increases by a factor of four, u increases by a factor of four, S increases by a factor of four
- B doubles, u increases by a factor of four, S doubles
- B doubles, u decreases by a factor of two, S decreases by a factor of two