JEE Main 2022 · 25 Jun · Shift 2 · Physics Q43

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PhysicsSingle correct+4 / -1Question 43 of 90

The electromagnetic waves travel in a medium at a speed of $2.0\times10^8$ m/s. The relative permeability of the medium is 1.0. The relative permittivity of the medium will be :

2.25

4.25

6.25

8.25

Answer and worked solution

Official answer: A

Refractive index. $n=\dfrac{3\times10^8}{2\times10^8}=1.5=\sqrt{\varepsilon_r\mu_r}$ , so $\varepsilon_r=2.25$ .

(A)

Topics:Properties of EM waves

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JEE Main 2022 · 25 Jun · Shift 2, Physics question 43