QJEEM21Ph7d6f: JEE Main 2021 Physics - Class 12 JEEM21Ph7d6f Solution: A plane electromagnetic wave of frequency 500 MHz is travelling …

Question

Verified Solution • 2025–26 Session moderate

A plane electromagnetic wave of frequency 500 MHz is travelling in vacuum along y-direction. At a particular point in space and time,

\vec{B}

= 8.0

\times

10^{$-$ 8}

\hat{z}

T. The value of electric field at this point is :

(speed of light = 3

\times

10⁸ ms^{$-$ 1})

\hat{x}

,

\hat{y}

,

\hat{z}

are unit vectors along x, y and z directions.

Accepted Answer

E_{0} = B . C

E_{0} = (8 \times 10^{- 8}) \times (3 \times 10^{8})

\Rightarrow E_{0} = 24

Direction of wave travelling is in

\vec{E} \times \vec{B}

So,

(- \hat{x}) \times \hat{z} = + \hat{y}

∴

\hat{E} = - 24 \hat{x}

V/m

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