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8.Electromagnetic waves
easy
In a plane electromagnetic wave, which of the following has/ have zero average/value in one complete cycle?
$(a)$ Magnetic field
$(b)$ Magnetic energy
$(c)$ Electric field
$(d)$ Electric energy
A
$(a), (c)$
B
$(b), (c)$
C
$(a), (d)$
D
All of these
Solution
(a)
Both $\vec{E}$ and $\vec{B}$ are sinusoidal, so over a complete cycle, its value will be zero.
Standard 12
Physics