Answer to Question #196818 in Electricity and Magnetism for CHARAN

Question

Check the validity of the following two equations to express an

electromagnetic wave.

E = k Eosin(ky+ wt) ;B = i Bosin(ky + wt)

Answer 1

Answer

Not possible as because of propagation of wave is given by $E\times B$ (i.e y )and it is not confirmed by

Wave $=E\times B$

$=jE_oB_osin(ky+wt)sin(ky+wt)\\$

$=jE_oB_osin^2(ky+wt)$

j (cross product of k and i as k$\times$ i = j) denotes the direction towards +y .

It must be in -y direction , to get desired answer.