In an electromagnetic wave, the electric magnetising fields are 1… - Vidyadip

MCQ

In an electromagnetic wave, the electric magnetising fields are $\frac{100\text{V}}{\text{m}}$ and $\frac{0.265\text{A}}{\text{m}}$ The maximum energy flow is?

A
$\frac{26.5\text{W}}{\text{m}^2}$
B
$\frac{36.5\text{W}}{\text{m}^2}$
C
$\frac{46.7\text{W}}{\text{m}^2}$
D
$\frac{765\text{W}}{\text{m}^2}$

✓

Answer

$\frac{26.5\text{W}}{\text{m}^2}$

Explanation:

Maximum rate of energy flow, S = E₀ × H₀

Given, $\text{E}_0=\frac{100\text{V}}{\text{m}},\text{H}_0=\frac{0.265\text{A}}{\text{m}}$

$\therefore\text{S}=100\times0.265=\frac{26.5\text{W}}{\text{m}^2}$

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