In a plane electromagnetic wave, the electric field oscillates with amplitude $$20Vm$$−$$1$$, then the energy density of magnetic field is (in$$ $$J/m3$$ $$)

Question

In a plane electromagnetic wave, the electric field oscillates with amplitude  $$20Vm$$−$$1$$, then the energy density of magnetic field is (in$$ $$J/m3$$ $$)

Infinity Learn · Accepted Answer

Average energy density of magnetic field  $$=B2rms2$$μ$$0=(B0/2)22$$μ$$0=14B02$$μ$$0But$$  $$B0=E0CAverage$$ energy density of electric $$field=$$  $$14$$×$$E02C2$$μ$$0But$$    $$C=1$$μ$$0$$∈$$0$$ ∴$$E0=1C2$$μ$$0$$ Hence,  Average energy density ofmagnetic field $$=$$ $$14$$×∈$$0E02=14$$×$$8.55$$×$$10$$−$$12$$×$$(20)2$$                                                                                                              $$=$$ $$8.55$$×$$10$$−$$10J/m3$$

In a plane electromagnetic wave, the electric field oscillates with amplitude $20 V m^{- 1}$ , then the energy density of magnetic field is (in $J / m^{3}$ )

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In a plane electromagnetic wave, the electric field oscillates with amplitude 20Vm−1, then the energy density of magnetic field is (in J/m3 )

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In a plane electromagnetic wave, the electric field oscillates with amplitude $20 V m^{- 1}$ , then the energy density of magnetic field is (in $J / m^{3}$ )