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Question

In a wave E0=100Vm-1. Find the Poynting vector magnitude.


A

13.25Wm-2

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B

26.5Wm-2

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C

18.25Wm-2

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D

19.7Wm-2

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Solution

The correct option is B

26.5Wm-2


Step 1: Given data

E0=100Vm-1

Step 2: Formula used

s=E02cμ0

Where s is the Poynting vector, E0 is the electric field, c is the speed of light and μ0 is the permeability.

Step 3: Finding the magnitude of the Poynting vector

We know the magnitude of the Poynting vector,

s=E02cμ0s=10023×108×4π×10-7s=26.5Wm-2

The magnitude of the poynting vector is 26.5Wm-2.

Hence, option B is correct.


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