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Question

A plane electromagnetic wave of frequency 20 MHz travels through a space along x direction. If the electric field vector at a certain point in space is 6 V $$m^{-1}$$, what is the magnetic field vector at that point?


A
2×108T
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B
12×108T
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C
2T
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D
12T
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Solution

The correct option is A $$2\times 10^{-8}T$$
Velocity of EM wave      $$v = 3\times 10^{8}$$  $$m/s$$
Electric field vector     $$E = 6$$  $$V/m$$
Thus magnetic field vector     $$B = \dfrac{E}{v}$$
$$\therefore$$    $$B = \dfrac{6}{3\times 10^8} =2\times 10^{-8}$$  $$T$$  

Physics

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