Assume the amplitude of the electric field in a plane electromagnetic wave is E1 and the amplitude of the magnetic field is B1 The source of the wave is then adjusted so that the amplitude of the electric field doubles to become 2E1.i) what happens to the amplitude of the magnetic field in this process? a) it becomes 4 times larger? b) it becomes 2 times larger? c) it can stay constant d) it becomes 1/2 as large ? e) it becomes 1/4 as large?ii) What happens to the intensity of the wave? Choose from the same possibilities.

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Asked Mar 24, 2020
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Assume the amplitude of the electric field in a plane electromagnetic wave is E1 and the amplitude of the magnetic field is B1 The source of the wave is then adjusted so that the amplitude of the electric field doubles to become 2E1.

i) what happens to the amplitude of the magnetic field in this process? a) it becomes 4 times larger? b) it becomes 2 times larger? c) it can stay constant d) it becomes 1/2 as large ? e) it becomes 1/4 as large?

ii) What happens to the intensity of the wave? Choose from the same possibilities.

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Expert Answer

Step 1

Write the expression for the amplitude ratio of the electric field to the magnetic field, and solve for the initial amplitude of the electric field.

Physics homework question answer, step 1, image 1

Step 2

Write the expression for the amplitude ratio of the electric field to the magnetic field, and solve for the amplitude of the magnetic field after the adjusting the amplitude of the electrical filed as doubled than before.

Physics homework question answer, step 2, image 1

Step 3

(i)

 

From the above calculation, it can inferred that when the amplitude of the electrical filed as doubled than before, the amplitude of the magnetic field will also...

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