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Question

A plane electromagnetic wave of frequency 20MHz travels through space along the X-direction. If the electric field vector at a certain point in space is6Vm-1, what is the magnetic field vector at that point?


A

2x10-8T

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B

12x10-8T

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C

2T

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D

12T

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Solution

The correct option is A

2x10-8T


Explanation for the correct answer is,

Step 1. Given Data:

Frequency electromagnetic wave =20MHz

Velocity of EM wave, v=3×108ms

Electric field vector, E=6Vm

Step 2. The magnetic field:

We know that,

Magnitude of Electric Field E= Magnetic Field B×Speed of light C

E=B×CB=EC

B=6(3x108)B=2x10-8T

Hence, the correct option is (A).


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