The rms value of the electric field of the light coming from the Sun is 720 N/C . The average total energy density of the electromagnetic wave is: - Physics MCQ AIEEE 2006 2026 | ExamTest.live

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The rms value of the electric field of the light coming from the Sun is 720 N/C . The average total energy density of the electromagnetic wave is:

Solution & Step-by-step Explanation

The average energy density u_{a vg} of an electromagnetic wave is given by: u_{a vg} = ϵ_{0} E_{r m s}^{2} Given E_{r m s} = 720 N/C and ϵ_{0} = 8.85 \times 1 0^{- 12} F/m . u_{a vg} = (8.85 \times 1 0^{- 12}) \times (720)^{2} u_{a vg} = 8.85 \times 1 0^{- 12} \times 518400 u_{a vg} \approx 4.58 \times 1 0^{- 6} J/m^{3}

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The rms value of the electric field of the light coming from the Sun is 720 N/C . The average total energy density of the electromagnetic wave is:

3.3 \times 1 0^{- 3} J/m^{3}

4.58 \times 1 0^{- 6} J/m^{3}

6.37 \times 1 0^{- 9} J/m^{3}

81.35 \times 1 0^{- 12} J/m^{3}

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