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Introduction to electromagnetic waves - class-XII

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Multiple Choice

Choose the correct answer from the alternatives given.
A plane electromagnetic wave of frequency $25 MHz$ travels in free space along $X$-direction. At a particular point in space and time, electric field $\vec E=6.3\ \hat j\ V/m$. What is $B$ at this point.

$1.2 \, \times \, 10^{-6} \, T$
$1.2 \, \times \, 10^{-8} \, T$
$2.1 \, \times \, 10^{-6} \, T$
$2.1 \, \times \, 10^{-8} \, T$