Physics · 2026
JEE Main · 23 January 2026, Shift 1 · Q48
The equation of the electric field of an electromagnetic wave propagating through free space is given by: E=√ 377 sin (6.27 × 10^3 t-2.09 × 10^-5 x)…
The equation of the electric field of an electromagnetic wave propagating through free space is given by $\displaystyle : E=\sqrt{377} \sin \left(6.27 \times 10^3 t-2.09 \times 10^{-5} x\right) \mathrm{N} / \mathrm{C}$The average power of the electromagnetic wave is $\displaystyle \left(\frac{1}{\alpha}\right) \mathrm{W} / \mathrm{m}^2$. The value of $\displaystyle \alpha$ is $\displaystyle \_\_\_\_$
$$\left(\text { Take } \sqrt{\frac{\mu_0}{\varepsilon_o}}=377 \text { in SI units }\right)
$$
Official answer
From NTA’s final answer key for this paper.
2
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.