Physics · Electromagnetic Waves
The electric field in an electromagnetic wave is given as E = 20 sin(ω(t - x/c)) j NC-1. The energy density of the electromagnetic wave in vacuum is: (Given ε0 = 8.85 × 10-12 C2/Nm2)
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 128.5 × 10-13 J/m3
- 217.7 × 10-13 J/m3
- 38.85 × 10-13 J/m3✓
- 488.5 × 10-13 J/m3
Correct answer
8.85 × 10-13 J/m3
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