The energy associated with electric field is
and with magnetic fields is
for an electromagnetic wave in free space. Then:
Text Solution
Verified by ExpertsThe correct answer is:
D
JEE Main 2019
Average energy density of magnetic field,

Average energy density of electric field,

Now,
and 


Since energy density of electric and magnetic field is same, so energy associated with equal volume will be equal i.e. 
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