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NEETPhysicsElectromagnetic Waves

Two transparent media, A and B , have relative permittivities _A and _B , and relative permeabilities _A and _B respectively. The ratio of the speed of light in medium A to that in medium B ( v_A : v_B ) is given by:

Options

  1. A_A _A _B _B
  2. B_B _B _A _A
  3. C_B _B _A _A
  4. D_A _B _B _A

Correct answer

B. _B _B _A _A

Step-by-step solution

The speed of light v in a material medium is given by the relation: v = c _r _r where c is the speed of light in vacuum, _r is the relative permeability, and _r is the relative permittivity of the medium. For medium A , v_A = c _A _A For medium B , v_B = c _B _B Taking the ratio of the two speeds: v_A v_B = c _A _A c _B _B = _B _B _A _A Answer: _B _B _A _A

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