First slide

Nature of electromagnetic wave

Question

A Plane electromagnetic wave of frequency 25 MHz travels in free space along the x-direction. At a particular point in space and time $\bar{E} = 6.3 \hat{j}$ . The magnetic field B at this point is

Moderate

A

4.2 × 10^-8 $\hat{k}$ T
B

2.1 × 10^-8 $\hat{k}$ T
C

18.9 × 10⁸ $\hat{k}$ T
D

2.1 × 10⁸ $\hat{k}$ T

Solution

$\begin{array}{rcl} C & = & \frac{E}{B}; \\ B & = & \frac{E}{C} = \frac{6.3}{3 x 10^{8}} = 2.1 x 10^{- 8} \\ \bar{B} & = & 2.1 x 10^{- 8} \hat{k} T \end{array}$

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