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Energy Density of an EM Wave for JEE: 14 solved questions

Real JEE paper questions on energy density of an em wave, part of electromagnetic waves. Each opens with the options, the correct answer and a step-by-step solution. Papers run from 2006 to 2025. No sign-in needed to read them.

What this topic asks

• Instantaneous and average energy density — 11 questions
• Energy in a stated volume — 3 questions

All 14 questions with solutions

• The energy associated with electric field is (U_E) and with magnetic field is (U_B) for an electromagnetic wa… JEE Main 9th Jan 2nd Shift 2019
• During the propagation of electromagnetic waves in a medium JEE Main 2014
• Given below are two statements: Statement I: Electromagnetic waves carry energy as they travel through space… JEE Main 31st Jan 2nd Shift 2024
• For the plane electromagnetic wave given by E = E₀ sin(ω t - kx) and B = B₀ sin(ω t - kx), the ratio of avera… JEE Main 6th April 1st Shift 2023
• The energy density associated with electric field E⃗ and magnetic field B⃗ of an electromagnetic wave in free… JEE Main 6th April 2nd Shift 2023
• For an electromagnetic wave travelling in free space, the relation between average energy densities due to el… JEE Main 16th March 1st Shift 2021
• An electromagnetic wave of frequency 1 × 10¹⁴ Hertz is propagating along z-axis. The amplitude of electric fi… JEE Main Online 2014
• The rms value of the electric field of the light coming from the sun is 720 N/C. The average total energy den… JEE Main 2006
• In a plane EM wave, the electric field oscillates sinusoidally at a frequency of 5 × 10¹⁰ Hz and an amplitude… JEE Main 31st Jan 1st Shift 2024
• The ratio of average electric energy density and total average energy density of electromagnetic wave is JEE Main 1st Feb 2nd Shift 2023
• The electric field in an electromagnetic wave is given by E = (50 N C⁻¹ sin ω(t - x/c). The energy contained… JEE Main 31st Aug 1st Shift 2021
• Due to presence of an EM-wave whose electric component is given by E = 100 sin(ω t - kx) NC⁻¹, a cylinder of… JEE Main 28th Jan 1st Shift 2025
• The electric field in an electromagnetic wave is given as E⃗ = 20 sin(ω(t - x/c)) ȷ̂ NC⁻¹ where ω and c are a… JEE Main 11th April 1st Shift 2023
• The energy of an electromagnetic wave contained in a small volume oscillates with JEE Main 10th April 1st Shift 2023