Which of the following are true about electromagnetic waves?
The magnitude of the electric field is always larger, or equal to, the magnitude of the magnetic field in an electromagnetic wave
II. If a wave's electric field points in the +y direction while the magnetic field points in -x, the wave is traveling in the +z direction
III. If the intensity of a wave doubles, the magnitude of the electric field doubles
IV. If the intensity of a wave doubles, the magnitude of the magnetic field quadruples
V. The energy in an electromagnetic wave is transferred along the direction of both the electric and magnetic fields
(1) I, II
(2) II, IV
(3) III, IV
(4) I, II, IV
(5) I, II, IV, V