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Physics · 2024 · 2 marks
CBSE 2024 · Region 2 · Set 1 · Q23
(a) On what factors does the speed of an electromagnetic wave in a medium depend? (b) How is an electromagnetic wave produced? (c) Sketch a schematic…
(a)
On what factors does the speed of an electromagnetic wave in a medium depend?
(b)
How is an electromagnetic wave produced ?
(c)
Sketch a schematic diagram depicting the electric and magnetic fields for an electromagnetic wave propagating along z -axis.
Marking-scheme solution
(a)
Speed of EM waves $\displaystyle v=\frac{1}{\sqrt{\mu \varepsilon}}$
Speed depends upon:
(i)
Permittivity $\displaystyle (\varepsilon)$ of medium
(ii)
Magnetic permeability $\displaystyle (\mu)$ of medium
(b)
Accelerated charges or oscillating charges produce electromagnetic waves.
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CBSE Class 12 Physics past-paper question from the 2024 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.