List of top Physics Questions

A straight wire carrying current \( I \) is lying along the axis of a circular loop carrying current \( I \). The force on this wire due to the circular loop is proportional to (Assume the axis of the circular loop is perpendicular to the plane of the loop).
The sum of two point positive charges separated by a distance of 1.5 m in air is \( 25 \, \mu\text{C} \). If the electrostatic force between the two charges is 0.6 N, then the difference between the two charges is
Two charged conducting spheres of radii 5 cm and 10 cm have equal surface charge densities. If the electric field on the surface of the smaller sphere is E, then the electric field on the surface of the larger sphere is
If the energy stored in a spherical conductor having a charge of \( 12 \, \mu C \) is \( 6 \, \text{J} \), then the radius of the spherical conductor is:
One of the two identical capacitors having the same capacitance C, is charged to a potential \(V_1\) and the other is charged to a potential \(V_2\). If they are connected with their like plates together, then the decrease in the electrostatic potential energy of the combined system is
As shown in the figure, if the values of the electric potential at three points A, B and C in a uniform electric field (\( \vec{E} \)) are \(V_A\), \(V_B\), and \(V_C\) respectively, then
electric potential at three points A, B and C
Three particles of each charge $q$ are placed at the vertices of an equilateral triangle of side $L$. The work to be done to decrease the side of the triangle to $\dfrac{L{2}$ is}
The radii of inner and outer spheres of a spherical capacitor are $8~\text{cm$ and $9~\text{cm}$ respectively. The outer sphere is earthed and the inner sphere is charged. If the space is filled with a dielectric constant $K = 5$, the capacitance is}
A solid of mass 1 kg has \(6 \times 10^{24}\) atoms. If one electron is removed from every one atom of 0.005% of the atoms, then the charge gained by the solid is
A particle of mass \( 0.2 \) g and charge \( 2 \) C is released from rest in a uniform electric field of \( 20 \) N/C. The kinetic energy of the particle after moving a distance of \( 20 \) cm is:
If 27 identical charged conducting spheres, each of capacitance \( 10 \mu F \), combine to form a big sphere, then the capacitance of the big sphere is:
A drop of radius \( R \) breaks into \( n \) equal drops. What is the ratio of total final surface energy to initial surface energy?
State the formula for angle of banking.
A body of mass 0.8 kg performs linear S.H.M. It experiences a restoring force of 0.4N, when its displacement from mean position is 4 cm. Determine Force constant and Period of S.H.M.
An electric dipole consists of charges \(\pm 4 \mu C\) separated by a distance of \(6\,cm\). Calculate the electric field at a point on the axial line at a distance \(20\,cm\) from its center.
A charge \( q \) enters with speed \( v \) in the direction of magnetic field \( B \). The force on the charge in magnetic field will be:
The angle between polarization plane and direction of propagation of electromagnetic waves is :
Resistance of an ideal p-n junction diode in reverse bias is:

With the help of the given circuit, find out the total resistance of the circuit and the current flowing through the cell.

 

Define self inductance.
Using Newton's law of viscosity for streamline flow, derive an expression for coefficient of viscosity.
If a charge of 3 nC is placed at each vertex of a cube of side 3 m, then the electric potential at the centre of the cube is:
If the speed of light in glass is $ 2 \times 10^8 \, m/s $ and the speed of light in air is $ 3 \times 10^8 \, m/s $, the refractive index of glass with respect to air is:
In resonance condition, the frequency of L-C circuit is
The charge on a parallel plate capacitor is 200 μC and its capacitance is 4 μF. If the distance between the plates of the capacitor is 2 mm, then the electric force between the plates of the capacitor is