List of top Physics Questions asked in JEE Main

A rod of mass $m$ and length $L$ is released on a rail placed in a uniform magnetic field $B$ as shown. The circuit has resistance $R$. What will be the terminal velocity of the rod? v

Match the following as per dimensional formula.

A long cylindrical conductor with large cross section carries an electric current distributed uniformly over its cross-section. Magnetic field due to this current is:
[A.] maximum at either end of the conductor
[B.] maximum at the axis of the conductor and minimum at the midpoint
[C.] minimum at the surface of the conductor
[D.] minimum at the axis of the conductor
[E.] same at all points in the cross-section of the conductor
Choose the correct answer from the options given below:

When the position vector \[ \vec r = x\hat{i}+y\hat{j}+z\hat{k} \] changes sign as $\vec r \rightarrow -\vec r$, which one of the following vectors will {not flip under sign change?}

What will be the ratio of the wavelength of the 3rd line of the Paschen Series to the 2nd line of the Balmer series of H-atom?

A $12\,\text{F}$ capacitor is connected to a $5\,\text{V}$ battery and fully charged. After disconnecting the battery, it is connected in parallel to an uncharged $6\,\text{F}$ capacitor. Find the final charge on the $6\,\text{F}$ capacitor.

Suppose a long solenoid of 100 cm length, radius 2 cm having 500 turns per unit length, carries a current $I = 10 \sin (\omega t)$ A, where $\omega = 1000$ rad./s. A circular conducting loop (B) of radius 1 cm coaxially slided through the solenoid at a speed $v = 1$ cm/s. The r.m.s. current through the loop when the coil B is inserted 10 cm inside the solenoid is $\alpha / \sqrt{2} \mu A$. The value of $\alpha$ is ___. [Resistance of the loop = 10 $\Omega$]

A soap bubble of diameter $7$ cm, its diameter is increased to $14$ cm. If change in its surface energy is $(15000 - x)\,\mu$J, find $x$. (Given surface tension = $0.04$ N/m)

The pulley shown in figure is made using a thin rim and two rods of length equal to diameter of the rim. The rim and each rod have a mass of $M$. Two blocks of mass of $M$ and $m$ are attached to two ends of a light string passing over the pulley, which is hinged to rotate freely in vertical plane about its center. The magnitudes of the acceleration experienced by the blocks is _________ (assume no slipping of string on pulley).

The exit surface of a prism with refractive index $n$ is coated with a material having refractive index $\dfrac{n}{2}$. When this prism is set for minimum angle of deviation, it exactly meets the condition of critical angle. The prism angle is ___.

As shown in the figure, six rods of same geometry are connected and maintained at temperatures $100^\circ\text{C}$ and $40^\circ\text{C}$. The temperature at points $A$ and $B$ are:

A curve is given between the potential energy $U$ of a particle and its position on the $x$-axis as shown. Given: \[ \tan\theta_1 = 1,\qquad \tan\theta_2 = 3,\qquad \tan\theta_3 = -\frac{1}{2} \] If $F_{AB}$ is the force acting on the particle during motion from $A$ to $B$, similarly $F_{BC}$, $F_{CD}$ and $F_{DE}$ are the forces during $B$ to $C$, $C$ to $D$ and $D$ to $E$ respectively, arrange the magnitudes of these forces in decreasing order.

Light is incident at such an angle so that minimum deviation takes place. Now a film of refractive index RI = $n/2$ is stick on other face such that total internal reflection takes place on second surface. Find angle of prism :

Rods $x$ and $y$ of equal dimensions but of different materials are joined as shown in figure. Temperatures of end points $A$ and $F$ are maintained at $100^\circ$C and $40^\circ$C respectively. Given the thermal conductivity of rod $x$ is three times of that of rod $y$, the temperature at junction points $B$ and $E$ are (close to):

A satellite is revolving around a planet in orbit radius of 1.5 R. Additional minimum energy required to transfer the satellite to the new orbit radius of 3R is (G and M are mass of satellite \& planet)

Find the dimensions of the expression $ \dfrac{\varepsilon_0 E}{T} $, where $ \varepsilon_0 $, $E$, and $T$ are permittivity, electric field, and time respectively.

A particle moves along the $x$-axis and has its displacement $x$ varying with time $t$ according to the equation \[ x = c_0 (t^2 - 2) + c(t - 2)^2 \] where $c_0$ and $c$ are constants of appropriate dimensions. Which of the following statements is correct?

A cubical block of density $ \rho_b = 600\,\text{kg/m}^3 $ floats in a liquid of density $ \rho_l = 900\,\text{kg/m}^3 $. If the height of block is $H = 8.0\,\text{cm}$, then height of the submerged part is ________ cm.

There is a galvanometer of resistance $100\Omega$ and full scale current $I_g = 1$ mA. Find shunt resistance required to increase its range to $5$ mA.

Find out the correct energy for the ground state or energy transition. (Symbols have usual meaning and $n \to m$ gives the transition)

A particle is falling under gravity. Air resistance on particle is F = $-$kv. Find correct option :

The equilateral triangular frame has current 2A. The side of frame is $4\sqrt{3}$ cm. Magnetic field at center C is:

A sinusoidal electromagnetic wave is given by $ \vec{E} = 20 \sin \left( \frac{2}{300} x - 10^6 t \right) $ propagating in a non-magnetic material. Dielectric constant of the material is.

For the given resistive network, the net resistance across $ AB = x $. Then find the value of $ x $.

Two identical circular loops $P$ and $Q$ each of radius $r$ are lying in parallel planes such that they have common axis. The current through $P$ and $Q$ are $I$ and $4I$ respectively in clockwise direction as seen from $O$. The net magnetic field at $O$ is: