JEE Main 2025 · PhysicsNumerical answerNumerical valueMediumCalculation

JEE Main 4 April 2025, Shift 2, Physics Q47

Question 47 of 75 in this shift, Physics question 22 of 25, Section B.

If an optical medium possesses a relative permeability of

\frac{10}{\pi}

and relative permittivity of

\frac{1}{0.0885}

, then the velocity of light is greater in vacuum than that in this medium by __________ times. (

\mu_0=4\pi\times10^{-7}

H/m,

\epsilon_0=8.85\times10^{-12}

F/m,

c=3\times10^8

m/s)

Official answer

NTA final key.

Same idea in other shifts