Infrared is the least energetic thus having biggest wavelength (λ)& gamma rays are most energetic thus having smallest wavelength (λ).
Match List-I with List-II : $\begin{array}{|c|c|c|c|}
\hline & \text { List-I } & & \text { List-II } \
\hline & \text { EM-Wave } & & \text { Wavelength Range } \
\hline \text { (A) } & \text { Infra-red } & \text { (I) } & < 10^{-3} \mathrm{nm} \
\hline \text { (B) } & \text { Ultraviolet } & \text { (II) } & 400 \mathrm{nm} \text { to } 1 \mathrm{nm} \
\hline \text { (C) } & \text { X-rays } S & \text { (III) } & 1 \mathrm{mm} \text { to } 700 \mathrm{nm} \
\hline \text { (D) } & \text { Gamma rays } & \text { (IV) } & 1 \mathrm{nm} \text { to } 10^{-3} \mathrm{~nm} \
\hline
\end{array}$
Held on 5 Apr 2024 · Verified 6 Jul 2026.
(A)-(III), (B)-(II), (C)-(IV), (D)-(I)
(A)-(II), (B)-(I), (C)-(IV), (D)-(III)
(A)-(IV), (B)-(III), (C)-(II), (D)-(I)
(A)-(I), (B)-(III), (C)-(II), (D)-(IV)
Sign in to track your attempts and accuracy.
Sign in to keep a private note on this question. Nothing you write is ever public.
A short bar magnet placed with its axis at $30^{\circ}$ with an external field of 800 Gauss, experiences a torque of $0.016 \mathrm{~N}. \mathrm{m}$. The work done in moving it from most stable to most unstable position is $\alpha \times 10^{-3} \mathrm{~J}$. The value of $\alpha$ is $\_\_\_\_$.
A small cube of side $1$ mm is placed at the centre of a circular loop of radius $10$ cm carrying a current of $2$ A. The magnetic energy stored inside the cube is $\alpha \times 10^{-14}$ J. The value of $\alpha$ is _______. ($\mu_o = 4\pi \times 10^{-7}$ Tm/A, $\pi = 3.14$)
A circular coil of radius $2$ cm and $125$ turns carries a current of $1$ A. The coil is placed in a uniform magnetic field of magnitude $0.4$ T. The axis of the coil makes an angle of $30°$ with the direction of the magnetic field. The torque acting on the coil is $\alpha \times 10^{-4}$ N.m. The value of $\alpha$ is ______. ($\pi=3.14$)
$1\,\mu$C charge moving with velocity $\vec{v} = \left(\hat{i} - 2\hat{j} + 3\hat{k}\right)$ m/s in the region of magnetic field $\vec{B} = \left(2\hat{i} + 3\hat{j} - 5\hat{k}\right)$ T. The magnitude of force acting on it is $\sqrt{\alpha} \times 10^{-6}$ N. The value of $\alpha$ is _______.
A series LCR circuit with $R = 20\ \Omega$, $L = 1.6\text{ H}$ and $C = 40\ \mu\text{F}$ is connected to a variable frequency a.c. source. The inductive reactance at resonant frequency is _______ $\Omega$.
Work through every JEE Main Electromagnetism PYQ, year by year.