CUET · PHYSICS · PYQ PAPER 2023
Electromagnetic waves travel in a medium at a speed of \( 1.5 \times 10^8 \text{ m/s} \). The relative permeability of the medium is 0.4. The relative permittivity of the medium will be:
- A 10
- B 6
- C 5
- D 20
Answer & Solution
Correct Answer
(A) 10
Step-by-step Solution
Detailed explanation
\( v = \frac{c}{\sqrt{\mu_r \varepsilon_r}} \Rightarrow \varepsilon_r = \frac{1}{\mu_r} \left(\frac{c}{v}\right)^2 \) \( \varepsilon_r = \frac{1}{0.4} \left(\frac{3 \times 10^8 \text{ m/s}}{1.5 \times 10^8 \text{ m/s}}\right)^2 \)…
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