SATHEE: Optics Question 334

Optics Question 334

Question: If c is the speed of electromagnetic waves in vacuum, its speed in a medium of dielectric constant K and relative permeability $μ_{r}$ is

[Kerala PET 2005]

Options:

A) $v = \frac{1}{\sqrt{μ_{r} K}}$

B) $v = c \sqrt{μ_{r} K}$

C) $v = \frac{c}{\sqrt{μ_{r} K}}$

D) $v = \frac{K}{\sqrt{μ_{r} C}}$

Show Answer

Answer:

Correct Answer: C

Solution:

Speed of light of vacuum $c = \frac{1}{\sqrt{μ_{0} ε_{0}}}$

and in another medium $v = \frac{1}{\sqrt{μ ε}}$

$\frac{c}{v} = \sqrt{\frac{μ ε}{μ_{0} ε_{0}}} = \sqrt{μ_{r} K}$

Therefore $v = \frac{c}{\sqrt{μ_{r} K}}$

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Optics Question 334

Question: If c is the speed of electromagnetic waves in vacuum, its speed in a medium of dielectric constant K and relative permeability μr is

Options:

Answer:

Solution:

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Question: If c is the speed of electromagnetic waves in vacuum, its speed in a medium of dielectric constant K and relative permeability $μ_{r}$ is