JEE MAIN - Physics (2021 - 27th August Evening Shift - No. 25)
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 ___________.
Answer
2
Explanation
$$|B|\, = {{|E|} \over C} = {6 \over {3 \times {{10}^8}}}$$
= 2 $$\times$$ 10$$-$$8 T
$$\therefore$$ x = 2
= 2 $$\times$$ 10$$-$$8 T
$$\therefore$$ x = 2
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