CUET · PHYSICS · PYQ PAPER 2023
Electromagnetic wave travels with speed of \(2.0 \times 10^8 m / s\) in any medium of relative permeability ( \(\mu_r\) ) 1.5. Find the relative permittivity of the medium ( \(\epsilon_r\) )
- A 1.25
- B 1.50
- C 2.25
- D 2.50
Answer & Solution
Correct Answer
(B) 1.50
Step-by-step Solution
Detailed explanation
\(\epsilon_r = \frac{c^2}{v^2 \mu_r}\) \(\epsilon_r = \frac{(3.0 \times 10^8)^2}{(2.0 \times 10^8)^2 \times 1.5}\) \(\epsilon_r = \frac{9.0 \times 10^{16}}{4.0 \times 10^{16} \times 1.5}\) \(\epsilon_r = 1.5\)
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