The correct option is A UE=UB
Average energy density of magnetic field, uB=B202μ0,B0 is maximum value of magnetic
field.
Average energy density of electric field,
Average energy density of electric field,
uE=ε0∈202
now, ∈0=CB0,C2=1μ0∈0
μE=∈02×C2B20
=∈02×1μ0∈0×B20=B202μ0=μB
uE=uB
since energy density of electric & magnetic
field is same, energy associated with equal
volume will be equal.
uE=uB