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BITSAT 2024Paper 2

Exam: BITSAT
Year: 2024
Paper: Paper 2
Subject: Physics
Chapter: Electromagnetic Waves

BITSAT 2024 · Paper 2 · Physics · Electromagnetic Waves

Electromagnetic waves travel in a medium with speed of 1.5 × 10^8...

Electromagnetic waves travel in a medium with speed of

1.5 \times 10^8 \mathrm{ ms}^{-1}

. The relative permeability of the medium is 2.0. The relative permittivity will be :

Options

A $5$
B $1$
C $4$
D $2$

Correct answer

D. $2$

Step-by-step solution

v=\frac{C}{\sqrt{\mu_{\mathrm{r}} \epsilon_{\mathrm{r}}}}\Rightarrow 1.5 \times 10^8=\frac{3 \times 10^8}{\sqrt{2 \times \epsilon_{\mathrm{r}}}}\Rightarrow 2 \epsilon_{\mathrm{T}}=4 \Rightarrow \epsilon_{\mathrm{T}}=2

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