First slide

Average energy density of electromagnetic wave

Question

An electro magnetic wave is propagating through space, then at a point the ratio of energy density produced by electric component to the total energy density is

Moderate

A

1:1
B

1:2
C

2:3
D

1:4

Solution

$\begin{array}{l} u = u_{E} + u_{B} and u_{E} = u_{B} \\ ∴ \frac{u_{E}}{u} = \frac{u_{E}}{u_{E} + u_{B}} = \frac{u_{E}}{u_{E} + u_{E}} = \frac{1}{2} \end{array}$

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