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Questions  >>  CBSE XII  >>  Physics  >>  Electromagnetic waves
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Q)

Suppose that the electric field part of an electromagnetic wave in vaccum is $E= 3.1 \times N/c $ an $[(1/8 rad/m)y +(5.4 \times 10^8\;rad/s/t)$ write an expression for the magnetic field part of the wave

$\begin{array}{1 1} 1.03 \cos [1.8\;y + (5.4 \times 10^8)t ] \hat k \\ 10.3 \sin [1.8\;y + (5.4 \times 10^8)t ] \hat k \\ 10.3 \cos [1.8\;y + (5.4 \times 10^8)t ] \hat k \\ 1.03 \cos [1.8\;y + (5.4 \times 10^8)t ] \hat k \end{array} $

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A)
Solution :
$B= B_0 \cos (ky+wt) \hat k$
$B_0= \large\frac{E_0}{c}$
$\qquad= \large\frac{3.1}{3 \times 10^{8}}$
$\qquad= 1.03 \times 10^{-8}$
$\qquad= 10.3 \;nT$
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