Nature of electromagnetic wave

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Question

A plane e.m. wave of frequency 40 MHz travels along X - axis. At same point at same instant, the electric field E has maximum value of 750 N/C in Y - direction. The magnitude and direction of magnetic field is

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Solution

$\begin{array}{rcl} E_{0} & = & 750 {NC}^{- 1}; \\ C & = & \frac{E_{0}}{B_{0}} \\ B_{0} & = & \frac{E_{0}}{C} = \frac{750}{3 x 10^{8}} = 2.5 μT along Z - axis \end{array}$

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