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8.Electromagnetic waves
easy
Energy stored in electromagnetic oscillations is in the form of
A
Electrical energy
B
Magnetic energy
C
Both $(a) $ and $(b)$
D
None of these
Solution
We know that,
$E=\frac{F}{q} \text { and } F=Q \cdot V \cdot B$
$\Rightarrow E=\frac{1}{\sqrt{\mu_0 \varepsilon_0}} \times B-(1)\left(\text { as } V=\frac{1}{\sqrt{\mu_0 \varepsilon_0}}\right)$
Also, $E=\varepsilon_0 E^2=\frac{1}{2} \varepsilon_0 E^2+\frac{1}{2} \varepsilon_0 \times \frac{B^2}{\varepsilon_0 \mu}$.
$\Rightarrow E=\frac{1}{2} \varepsilon_0 E^2+\frac{1}{2} B^2 / \mu_0$
$\therefore$ It depends on both Electric and Magnetic field.
Standard 12
Physics
