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JEE Main 2014 Physics question

PhysicsElectromagnetic WavesJEE Main 2014

An electromagnetic wave of frequency hertz is propagating along z-axis. The amplitude of electric field is 4 V/m. If /N−, then average energy density of electric field will be:

Answer: (3)

Solution

The time average of is , so $ = Missing argument for \frac\frac12ε_0

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Question ID VK-104457