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Question: Answered & Verified by Expert
In a plane electromagnetic wave $U_E$ and $U_B$ are average energy densities of electric field and magnetic field respectively, then the correct option in the following is
PhysicsElectromagnetic WavesAP EAMCETAP EAMCET 2022 (07 Jul Shift 2)
Options:
  • A $U_E=\frac{U_B}{2}$
  • B $U_E=2 U_B$
  • C $U_E=U_B$
  • D $U_E \neq U_B$
Solution:
2711 Upvotes Verified Answer
The correct answer is: $U_E=U_B$
Energy of electromagnetic wave is equally shared between electric and magnetic fields, $U_E=U_B$.
i.e, $\frac{1}{2} \varepsilon_0 E^2=\frac{1}{2 \mu_0} B^2$

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