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JEE Main 2022 (25 Jun, Shift 2) · Speed of EM Waves in a Medium

Speed of EM Waves in a Medium question from JEE Main 2022 (25 Jun, Shift 2)

Q13JEE Main 2022 · 25 JUN · SHIFT 2Easy

Speed of EM Waves in a Medium

The electromagnetic waves travel in a medium at a speed of 2.0 ×\times 108 m/s. The relative permeability of the medium is 1.0. The relative permittivity of the medium will be:

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Answer: (a)

  1. μrεr=(cv)2=(3×1082×108)2=2.25\mu_r\varepsilon_r = \left(\dfrac{c}{v}\right)^2 = \left(\dfrac{3 \times 10^{8}}{2 \times 10^{8}}\right)^2 = 2.25.
  2. With μr=1\mu_r = 1: εr=2.25\varepsilon_r = 2.25.
  3. So the answer is (a) 2.25.
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