The energy associated with electric field is $(U_E)$ and with magnetic field is $(U_B)$ for an electromagnetic wave in free space. Then
The energy associated with electric field is $(U_E)$ and with magnetic field is $(U_B)$ for an electromagnetic wave in free space. Then
- [JEE MAIN 2019]
- A
${U_E} = \frac{{{U_B}}}{2}$
- B
$U_E\,>\,U_B$
- C
$U_E\,<\,U_B$
- D
$U_E\,=\,U_B$
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If this wave falls normally on a perfectly reflecting surface having an area of $100 \;{cm}^{2}$. If the radiation pressure exerted by the $E.M.$ wave on the surface during a $10\, minute$ exposure is $\frac{{x}}{10^{9}} \frac{{N}}{{m}^{2}}$. Find the value of ${x}$.
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