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Which one of the following is the property of a monochromatic, plane electromagnetic wave in free space?

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Electric and magnetic fields have a phase difference of $π / 2$

The energy contribution of both electric and magnetic fields are equal

The direction of propagation is in the direction of $\vec{B} \times \vec{E}$

The pressure exerted by the wave is the product of its speed and energy density

answer is B.

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Detailed Solution

In an em wave contribution of energy equally in E field and B field.

both are in phase orientation perpendicular to each other and perpendicular to direction of propagation and it is along $\overset{⇀}{E} \times \overset{⇀}{B}$

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