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JEE Main 2023 (1 Feb, Shift 2) · Energy Density & Intensity

Energy Density & Intensity question from JEE Main 2023 (1 Feb, Shift 2)

Q11JEE Main 2023 · 1 FEB · SHIFT 2Easy

Energy Density & Intensity

The ratio of average electric energy density and total average energy density of electromagnetic wave is:

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Answer: (d)

  1. In an EM wave the electric and magnetic average energy densities are equal.
  2. ⟨u⟩=⟨uE⟩+⟨uB⟩=2⟨uE⟩\langle u \rangle = \langle u_E \rangle + \langle u_B \rangle = 2\langle u_E \rangle
  3. ⟨uE⟩⟨u⟩=12\dfrac{\langle u_E \rangle}{\langle u \rangle} = \dfrac{1}{2}
  4. So the answer is (d) 12\frac{1}{2}.
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