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  4. 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 × 10-8 T. The value of x is .

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Q. 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 _______.

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Solution:

$| B |=\frac{| E |}{ C }=\frac{6}{3 \times 10^{8}}$
$=2 \times 10^{-8} T$
$\therefore x =2$