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Question:

During the propagation of electromagnetic waves in a medium: Electric energy density is equal to the magnetic energy density; Electric energy density is double of the magnetic energy density; Both electric and magnetic energy densities are zero; Electric energy density is half of the magnetic energy density

Electric energy density is equal to the magnetic energy density

Electric energy density is half of the magnetic energy density

Electric energy density is double of the magnetic energy density

Both electric and magnetic energy densities are zero

Solution:

During the propagation of electromagnetic waves in a medium: Electric energy density UE=1/2εE2. Now using B=E/c and c=1/√με, we get UE=1/2εE2=1/2B2/μ=UB. Electric energy density is equal to the magnetic energy density.