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8.Electromagnetic waves
medium
The energy density associated with electric field $\overrightarrow{ E }$ and magnetic field $B$ of an electromagnetic wave in free space is given by ( $\epsilon_0-$ permittivity of free space, $\mu_0$ - permeability of free space)
A
$U _{ E }=\frac{ E ^2}{2 \epsilon_0}, U _{ B }=\frac{ B ^2}{2 \mu_0}$
B
$U _{ E }=\frac{ E ^2}{2 \epsilon_0}, U _{ B }=\frac{\mu_0 B ^2}{2}$
C
$U _{ E }=\frac{\epsilon_0 E ^2}{2}, U _{ B }=\frac{\mu_0 B ^2}{2}$
D
$U _{ E }=\frac{\epsilon_0 E ^2}{2}, U _{ B }=\frac{ B ^2}{2 \mu_0}$
(JEE MAIN-2023)
Solution
$U _{ E }=\frac{1}{2} \epsilon_0 E ^2, U _{ B }=\frac{ B ^2}{2 \mu_0}$
Standard 12
Physics
