The average energy-density of electromagnetic wave given by…

Physics Electromagnetic Wave General MCQ (Single Correct)

The average energy-density of electromagnetic wave given by E = (50 N/C) sin ( ω t – kx) will be nearly

10 –8 J/m 3

10 –7 J/m 3

10 –6 J/m 3

10 –5 J/m 3

Text Solution

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The correct answer is:

Sol. Average energy density of electromagnetic wave

U av = ε 0 = × (8.85 × 10 –12 ) × (50) 2 ≈ 10 –8 J/m 3

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