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What Is the Average Value of the Magnitude of the Poynting

Question 19

Multiple Choice

What is the average value of the magnitude of the Poynting vector $\vec { S }$ at 1 meter from a 100-watt lightbulb radiating in all directions?

A) 1 W/m²
B) 4 W/m²
C) 2 W/m²
D) 8 W/m²
E) 12 W/m²

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