Physics · 2026
JEE Main · 23 January 2026, Shift 2 · Q41
The ratio of speeds of electromagnetic waves in vacuum and a medium, having dielectric constant k=3 and permeability of μ=2 μ_0, is ( μ_0=…
The ratio of speeds of electromagnetic waves in vacuum and a medium, having dielectric constant $\displaystyle k=3$ and permeability of $\displaystyle \mu=2 \mu_0$, is
( $\displaystyle \mu_0=$ permeability of vacuum)
Official answer
From NTA’s final answer key for this paper.
(4)
$\displaystyle \sqrt{6}: 1$
More from Electromagnetic Waves
- An electromagnetic wave travelling in x -direction is described by field equation E_y=300 sin ω(t-x/c). If the electron is restricted to move in y…2026
- Given below are two statements: one is labelled as Assertion and the other is labelled as Reason (R). Assertion: The electromagnetic wave exerts…2026
- A point light source emits E.M. waves in free space. A detector, placed at a distance of L m, measures the intensity as I_o. The detector is now…2026
- A displacement current of 4.0 A can be set up in the space between two parallel plates of 6 μ F capacitor. The rate of change of potential difference…2026
- For an electromagnetic wave propagating through vacuum, k, E and ω represent propagation vector, electric field and angular frequency, respectively.…2026
- An electromagnetic wave travels in free space along the x -direction. At a particular point in space and time, B=2 × 10^-7 j T is associated with…2026
- A magnetic field vector in an electromagnetic wave is represented by B=B_0 sin (2 π v t-(2 π x)/(λ)) j. Its associated electric field vector is ____.2026
JEE Main 2026 Physics question, with the answer from NTA’s final answer key. Where our answers come from.