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i. The electric and magnetic fields, \(\vec{E}\) and \(\vec{B}\) are always perpendicular to each other and also to the direction of propagation of the EM wave. Thus, the EM waves are transverse waves.
ii. The cross product \((\vec{E} \times \vec{B})\) gives the direction in which the EM wave travels. \((\vec{E} \times \vec{B})\) also gives the energy carried by EM wave.
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