List of top Physics Questions asked in JEE Main

A current carrying solenoid is placed vertically and a particle of mass m with charge Q is released from rest. The particle moves along the axis of solenoid. If g is acceleration due to gravity then the acceleration (a) of the charged particle will satisfy:
A 4 kg mass moves under the influence of a force \(\vec{F} = (4t^3\hat{i} - 3t^2\hat{j})\) N where t is the time in second. If mass starts from origin at t=0, the velocity and position after t = 2 s will be:

Two identical thin rods of mass M kg and length L m are connected as shown in figure. Moment of inertia of the combined rod system about an axis passing through point P and perpendicular to the plane of the rods is \(\frac{x}{12} ML^2\) kg m\(^2\). The value of x is ______ .

Potential energy (V) versus distance (x) is given by the graph. Rank various regions as per the magnitudes of the force (F) acting on a particle from high to low.

Find the volume flow rate in the venturi meter given below in which water is flowing.
In the following configuration of charges. Find the net dipole moment of the system :
An experiment is performed for comparing EMF of two cells using a potentiometer. For 1st cell, balancing length was achieved at 200 cm and for 2nd cell it was 150 cm. If least count of measurement of length of potentiometer wire is 1cm, the percentage error in the ratio of emf of two cells is :
For the given set of measurements, find the relative error. \[ 20.00,\ 19.75,\ 18.25,\ 17.01 \]
A conducting rod of mass \( m \) and length \( l \) is moving on an infinite pair of conducting rails as shown. Conducting rails are connected to a resistance \( R \) at one end. Motion is in the vertical plane and horizontal magnetic field in the region is \( B \). Find the terminal speed of the rod.
After release, the blocks moves 81 cm in 9 seconds. Find moment of inertia of the pulley :
(Given $m_{1} = 400$ gm, $m_{2} = 350$ gm, R = 2 cm, g = 10 m/s$^2$)
Density of water at 4\(^\circ\)C is 1000 kg/m\(^3\) and at 20\(^\circ\)C it is 998 kg/m\(^3\). If 4kg of water is heated from 4\(^\circ\)C to 20\(^\circ\)C, the change in internal energy of water is : (Given : specific heat capacity of water = 4200 J/kg K, Atmospheric pressure P = \(10^5\) Pa).

Two lenses one biconvex and other plano concave have same magnitude of power. The refractive indices of their materials are 1.5 and 1.7 respectively. If the radii of curvature of the lenses are as shown. find the ratio : \(\frac{R_1}{R_2}\) : 

300 J of energy is given to a gas at constant volume which increases its temperature from $20^\circ$C to $50^\circ$C. If $R = 8.3$ S.I. units and $C_v = \dfrac{5R}{2}$, find mass of gas.
An ideal gas in a closed rigid container is at 50$^\circ$C and pressure 3.23 kPa. If temperature is doubled, find new pressure in Pa :
A wave propagates whose electric field is given by \[ \vec{E} = 69 \sin(\omega t - kx)\,\hat{j}. \] Find the direction of the magnetic field.

For a gas P-V curve is given as shown in the diagram. Curve path follows equations \((V - 2)^2 = 4aP\). Find work done by gas in given cyclic process. 

In a potentiometer, the null point for two resistances \(R_1\) and \(R_2\) is at \(40\ \text{cm}\) as shown. If a \(16\,\Omega\) resistance is connected in parallel to \(R_2\), the null point shifts to \(50\ \text{cm}\). Find the values of \(R_1\) and \(R_2\) respectively.
Find the heat produced in the external circuit \( (AB) \) in one second.
Balls are dropped at regular intervals from height 5 m. If the first ball touches the ground when \(6^{th}\) ball is about to be dropped, find the height of \(4^{th}\) ball above the ground at the same instant :

Find work done in bringing charge q = 3nC from infinity to point A as shown in the figure : 

Three very long parallel wires carrying current as shown. Find the force acting at 15 cm length of middle wire : 

The equilateral triangular frame has current 2A. The side of frame is \(4\sqrt{3}\) cm. Magnetic field at center C is:
A circular coil of radius R carries current such that magnetic field at its centre is 16\(\mu\)T. Find the magnetic field on the axis at a distance of \(\sqrt{3}R\) from the centre of coil.
A bar magnet is kept such that it is making an angle of 30$^\circ$ with the magnetic field. The torque acting on the magnet is 0.016 N-m. Find the amount of work done by external agent in rotating the magnet from most stable position to most unstable position.
For a circular coil of radius \(R\), magnetic field at the center is \(B_0 = 16~\mu\text{T}\). What will be the magnetic field on the axis at a distance \(x = \sqrt{3}R\) from the center?