In an electromagnetic wave, the amplitude of electri field is 1 V/m, What is
(i) the amplitude of magnetic field?
(ii) average energy density of electric field ?
(iii) average energy density of magnetic field ?
(iv) average energy density of wave ?

Explanation

(i) As `(E_(0))/(B_(0))=c`
`rArr B_(0)=(E_(0))/(c)`
`rArr B_(0)=(1)/(3xx10^(8))=3.33nT`
(ii) `U_(E)=(1)/(4) epsi_(0)E^(2)=(1)/(4)xx8.85xx10^(-12)xx1^(2)`
`=2.2125xx10^(-12)J//m^(3)`
(ii) `U_(B)=U_(E)=2.2125xx10^(-12)J//m^(2)`
(iv) `U=U_(E)+U_(B)=4.425xx10^(-12)J//m^(3)`