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8.Electromagnetic waves
medium
એક વિધુતચુંબકીય તરંગ $-Z $ દિશામાં આગળ વઘતો હોય તો $E$ અને $ B$ ના ઘટકો કયા હશે?
A
$ {E_x},\,{B_y} $
B
$ {E_y},\,{B_x} $
C
$ {E_z},\,{B_x} $
D
$ {E_y},\,{B_z} $
Solution
(a)${E_x}$ and ${B_y}$ would generate a plane EM wave travelling in $z-$ direction. $\vec E$, $\vec B$ and $\vec k$ form a right handed system $\vec k$ is along $z-$ axis. As $\hat i \times \hat j = \hat k$
==> ${E_x}\hat i \times {B_y}\hat j = C\hat k$ i.e. $E$ is along $x-$ axis and $B$ is along $y-$ axis.
Standard 12
Physics
