JEE Main 2026 — Physics Electromagnetism
Match the LIST-I with LIST-II
A.B.C.D.List-IRadio-waveMicro-waveInfrared-waveX-rayI.II.III.IV.List-IIis produced by Magnetron valvedue to change in the vibrational modes of atomsdue to inner shell electrons moving from higher to lower energy leveldue to rapid acceleration of electrons
Choose the correct answer from the options given below:
Held on 24 Jan 2026 · Verified 6 Jul 2026.
A-IV, B-II, C-I, D-III
A-IV, B-I, C-II, D-III
A-IV, B-III, C-I, D-II
A-II, B-IV, C-III, D-I
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A magnetic field vector in an electromagnetic wave is represented by $\vec{B}=B_0\sin\left(2\pi vt-\dfrac{2\pi x}{\lambda}\right)\hat{j}$. Its associated electric field vector is ______.
A plane electromagnetic wave is moving in free space with velocity $c=3 \times 10^{8} \mathrm{~m} / \mathrm{s}$ and its electric field is given as $\vec{E}=54 \sin (k z-\omega t) \hat{j} \mathrm{~V} / \mathrm{m}$, where $\hat{j}$ is the unit vector along $y$-axis. The magnetic field vector $\vec{B}$ of the wave is:
A charged particle moves in a uniform magnetic field. If the velocity is perpendicular to the field, the path of the particle is:
A monochromatic source of light operating at $15$ kW emits $2.5\times 10^{22}$ photons/s. The region of an electromagnetic spectrum to which the emitted electromagnetic radiation belongs to ________. (Take $h=6.6\times 10^{-34}$ J·s and $c=3\times 10^8$ m/s).
An electromagnetic wave of frequency 100 MHz propagates through a medium of conductivity, $\sigma=10 \mathrm{mho} / \mathrm{m}$. The ratio of maximum conduction current density to maximum displacement current density is $\_\_\_\_$. $\left[\text{Take }\frac{1}{4 \pi \epsilon_{\mathrm{o}}}=9 \times 10^{9} \mathrm{Nm}^{2} / \mathrm{C}^{2}\right]$
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