First slide

Intensity of electromagnetic wave

Question

In an electromagnetic wave, the magnetic field is given by $B = 2 \times 10^{- 7} \sin (0.5 \times 10^{3} x + 1.5 \times 10^{11} t) t e s l a$ . The intensity of electromagnetic wave is about (in $\frac{W}{m^{2}}$ )

Moderate

A

2
B

8
C

10
D

5

Solution

Intensity of electromagnetic wave is $\frac{B_{0}^{2}}{2 μ_{0}} c$
$h e r e B_{0} = 2 \times 10^{- 7}$
$s o i n t e n s i t y I = \frac{4 \times 10^{- 14} \times 3 \times 10^{8}}{2 \times 4 π \times 10^{- 7}} = \frac{30}{2 π} \approx 5$

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