JEE Main 2024 Physics question
Electromagnetic waves travel in a medium with speed of 1.5 × 10⁸ ms⁻¹. The relative permeability of the medium is 2.0. The relative permittivity will be:
Answer: (D)
Solution
c/v = 2 = √(μ_rε_r) ⇒ μ_rε_r = 4 ⇒ ε_r = 2.