List of top Physics Questions asked in JEE Main

For the given circuit, find the reading of the ammeter just after the key(s) is closed.

In the following configuration of charges. Find the net dipole moment of the system :

If the electric potential is \(V = 500\) volts at the point \((10,\,20)\) and the electric field is given by \[ \vec{E} = 10x\,\hat{i} + 5y\,\hat{j}\ \text{N/C}, \] find the potential at the origin.

The energy of an electron in an orbit of the Bohr's atom is $-0.04 E_g$ where $E_g$ is the ground state energy. If $L$ is the angular momentum of the electron in this orbit and $h$ is the Planck's constant, then $\frac{2 \pi L{h}$ is _________} :}

Disk \( m_1 = 5 \, \text{kg} \) \& radius \( r_1 = 10 \, \text{cm} \) and disk \( m_2 = 10 \, \text{kg} \) \& radius \( r_2 = 50 \, \text{cm} \) are arranged as shown in the figure. Find the moment of inertia about an axis through the common tangent and parallel to the plane of the disks.

Electromagnetic wave with intensity \( I = 4 \times 10^{14} \, \text{watt/m}^2 \) is propagating in free space. Find the amplitude of magnetic field \( B_0 \). Given: \( c = 3 \times 10^8 \, \text{m/s}, \epsilon_0 = 8.85 \times 10^{-12} \, \text{C}^2/\text{N} \cdot \text{m}^2 \).

A ball of mass 100 g is projected with velocity 20 m/s at $60^\circ$ with horizontal. The decrease in kinetic energy of the ball during the motion from point of projection to highest point is:

Paratrooper jumps... opens parachute after 2s... initial height is ___ m.

Energy of first line of Lyman series - A Energy of second line of Balmer series - B Energy of first line of Balmer series - C Energy of second line of Lyman series - D What will be the correct decreasing order of energies of photons?

In a circuit there is a battery with internal resistance \( r \) and Emf \( E \), which is connected to external load resistance \( R \) as shown. Find the value of \( R \) so that maximum power dissipates across \( R \).

A projectile is projected with certain speed at an angle of 45\(^\circ\) with horizontal as shown. At t = 2s, projectile is at maximum height and at t = 3s, it just touches a wall at a height H above horizontal. Find H in meters:
(Assume g = 10 m/s\(^2\))

The ratio of de Broglie wavelength of a deuteron with kinetic energy \(E\) to that of an alpha particle with kinetic energy \(2E\) is \(n:1\). (Assume mass of proton \(=\) mass of neutron.) Find the value of \(n\).

A conducting circular loop is rotated about its diameter at a constant angular speed of \(100 \, \text{rad s}^{-1}\) in a magnetic field of \(0.5 \, \text{T}\), perpendicular to the axis of rotation. When the loop is rotated by \(30^\circ\) from the horizontal position, the induced EMF is \(15.4 \, \text{mV}\). The radius of the loop is ______________ mm.
(Take \( \pi = \dfrac{22}{7} \))

Given below are two statements:
Statement I: An object moves from position \( \vec{r}_1 \) to position \( \vec{r}_2 \) under a conservative force field \( \vec{F} \). The work done by the force is \[ W = -\int_{\vec{r}_1}^{\vec{r}_2} \vec{F} \cdot d\vec{r}. \]
Statement II: Any object moving from one location to another location can follow infinite number of paths. Therefore, the amount of work done by the object changes with the path it follows for a conservative force.
In the light of the above statements, choose the correct answer from the options given below:

When a light of a given wavelength falls on a metallic surface the stopping potential for photoelectrons is \(3.2\ \text{V}\). If a second light having wavelength twice of the first light is used, the stopping potential drops to \(0.7\ \text{V}\). The wavelength of the first light is ________ m.

A cylindrical block of mass $M$ and area of cross section $A$ is floating in a liquid of density $\rho$ with its axis vertical. When depressed a little and released the block starts oscillating. The period of oscillation is ___.

10kg ice at \(-10^\circ C\) & 100kg water at \(25^\circ C\) are mixed together. Find final temperature. (Given \(S_{ice} = \frac{1}{2}\) cal/g\(^\circ C\), \(L_{fusion} = 80\)cal/g and \(S_{water} = 1\)cal/g\(^\circ C\))

The equation of the electric field of an electromagnetic wave propagating through free space is given by: \(E = \sqrt{377} \sin(6.27 \times 10^3 t - 2.09 \times 10^{-5} x)\) N/C. The average power of the electromagnetic wave is (1/a) W/m². The value of a is_______. (Take \(\sqrt{\mu_0/\varepsilon_0} = 377\) in SI units)}

A large drum having radius $R$ is spinning around its axis with angular velocity $\omega$, as shown in figure. The minimum value of $\omega$ so that a body of mass $M$ remains stuck to the inner wall of the drum, taking the coefficient of friction between the drum surface and mass $M$ as $\mu$, is :

If an alpha particle with energy 7.7 MeV is bombarded on a thin gold foil, the closest distance from nucleus it can reach is_____ m.
(Atomic number of gold = 79 and \(\frac{1}{4\pi\epsilon_0}=9\times10^{9}\) SI units)