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Physics · 2026 · 4 marks
NEET 2026 · 21 June · Code 50 · Q38
An electromagnetic wave travelling in a lossless dielectric medium having a dielectric constant, ε r=9, has the electric field, E x=E 0 sin (kz-2 π ×…
An electromagnetic wave travelling in a lossless dielectric medium having a dielectric constant, $\displaystyle \epsilon_{\mathrm{r}}=9$, has the electric field, $\displaystyle \mathrm{E}_x=\mathrm{E}_0 \sin \left(\mathrm{kz}-2 \pi \times 10^6 \mathrm{t}\right)$ $\displaystyle \mathrm{Vm}^{-1}$ where $\displaystyle \mathrm{E}_0$ is the amplitude and k is the wave vector. Among the following options, the incorrect choice is :
Official answer
From NTA’s final answer key for this paper.
(2)
The wavelength of the electromagnetic wave inside the medium is $\displaystyle 300$ m
(3)
The magnetic field is given by the relation $\displaystyle \mathrm{B}_y=\frac{\mathrm{B}_0}{\nu} \sin \left(\mathrm{kz}-2 \pi \times 10^6 \mathrm{t}\right)$ where $\displaystyle \nu$ is the speed of the electromagnetic wave inside the medium
NTA’s answer key accepts either.
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NEET (UG) 2026 Physics question, with the answer from NTA’s final answer key. Where our answers come from.