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Q.

Total energy density of electromagnetic waves in vacuum is given by the relation

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a

12·E2ε0+B22μ0

b

E2+B2c

c

12ε0E2+12μ0B2

d

12ε0E2+B22μ0

answer is D.

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Detailed Solution

The energy in EM waves is divided equally between the electric and magnetic fields.

The total energy per unit volume,  u=ue+um

=12ε0E2+12B2μ0

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