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JEE Main 2021 (27 Aug, Shift 2) · Nature of EM Waves & Wave Equation

Nature of EM Waves & Wave Equation question from JEE Main 2021 (27 Aug, Shift 2)

Q45JEE Main 2021 · 27 AUG · SHIFT 2Easy

Nature of EM Waves & Wave Equation

A plane electromagnetic wave with frequency of 30 MHz travels in free space. At particular point in space and time, electric field is 6 V/m. The magnetic field at this point will be x $\times$ 10 $-$ 8 T. The value of x is ___________.

Numerical answer type. Work it out, then open the answer.

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Answer: 2

$B = \dfrac{E}{c}$ (frequency is not needed).
$B = \dfrac{6}{3\times10^{8}} = 2\times10^{-8}\text{ T}$
So $x = 2$ .

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