CUET Preparation Today
A radio wave of frequency 90 MHz enters a ferrite rod. If $ε_r = 10^3$ and $\mu_r = 10$, then the velocity and wavelength of the wave in ferrite are |
3 × 108 ms−1; 3.33 × 10−2 m 3 × 106 ms−1; 3.33 × 10−2 m 3 × 108 ms−1; 3.33 × 10−1 m 3 × 107 ms−1; 3.33 × 10−3 m |
3 × 106 ms−1; 3.33 × 10−2 m |
Refractive Index is $ n = \sqrt{\mu_r \epsilon_r} = \sqrt{10^4} = 100$ Velocity in ferrite is $V_{ferrite}=\frac{c}{\sqrt{\mu_rε_r}}=\frac{3×10^8}{\sqrt{10×10^{3}}}=3×10^6 ms^{-1}$ Wavelength in ferrite $λ_{ferrite}=\frac{V_{ferrite}}{\nu}=\frac{3×10^6}{90×10^6}=3.33 × 10^{-2} \, m$ |
