List of top Physics Questions

A fully charged capacitor 'C' with initial charge 'q0' is connected to a coil of self inductance 'L' at t = 0. The time at which the energy is stored equally between the electric field and the magnetic field is
Which of the following statement proves that Earth has a magnetic field?

A long solenoid has 500 turns, when a current of 2A is passed through it, the resulting flux linked with each turns of solenoid is 4 x 10-3 Wb, then the self induction of solenoid is

An alternating current is given by i = i1 sin ωt + i2 cos ωt. The r.m.s. current is given by 

A wire of a certain material is stretched slowly by 10%. Its new resistance and specific resistance becomes respectively
If a voltage across a bulb rated 220 V, 100 W drops by 2.5 % of rated value. the percentage of rated value by which the power would decrease is

A circular coil of wire of radius 'r' has 'n' turns and carries a current ' I '. The magnetic induction 'B' at a point on the axis of the coil of distance √3 r from its center is

A galvanometer of resistance 50 Ω is connected to the battery of 3 V along with a resistance 2950 Ω in series. A full scale deflections of 30 divisions is obtained in galvanometer. In order to reduce this deflections to 20 division, the resistance in series should be
Wire bound resistors are made by
A charged particle is moving in an electric field of \(3 \times 10^{-10} \, \text{V} \, \text{m}^{-1}\) with mobility \(2.5 \times 10^{-6} \, \text{m}^2/\text{V}/\text{s}\) . Its drift velocity is
A parallel plate capacitor is charged by connecting a 2 Volt battery across it. It is then disconnected from the battery and a glass slab is introduced between plates. Which of the following pair of quantities decrease ?

Two tiny sphere carrying a charges 1.8 µC and 2.8 µC are located at 40 cm apart. The potential at the mid-point of the line joining the two charges is 

When a metal conductor is connected to left gap of meter bridge is heated, the balancing point

In an atom electrons revolve around the nucleus along a path of radius 0.72 A making 9.4 x 1014 revolutions per second. The equivalent current is. (Given e = 1.6 x 10-19 C)

10 identical cells each of potential 'E' and internal resistance 'r' are connected in series , so formed a closed circuit. An ideal voltmeter is connected across three cells will read

An electric dipole with dipole moment 4 x 10-9 Cm is aligned at 30 degree with the direction of the uniform electric field of magnitude 5 x 104 NC-1. The magnitude of the torque acting on the diapole is 

A transformer operating at primary voltage 8 kV and secondary voltage 160 V serves a load of 80 kW. Assuming the transformer to be ideal with purely resistive load and working on unity power factor, the loads in the primary and secondary circuit would be

The kinetic energy of photoelectrons increases by 0.52 eV when the wavelength of incident light is changed from 500 nm to another web length which is approximately

Electrical as well as gravitational effects can be thought to be caused by fields. Which of the following is true for an electrical and gravitational field ?

The displacement of a particle executing SHM is given by X = 3 sin [2πt + π/4] , where 'X' is in meter and 't' is in second. The amplitude and maximum speed of the particle is 

The electric field and the potential of an electric dipole vary with distance 'r' as 

A charge particle of mass 'm' and charge 'q' is released from rest in an uniform electric field 'E'. Neglecting the effect of gravity, the kinetic energy of the charged particle after 't' second is 

A metallic rod breaks when strain produced is 0.2%. The Young's Modulus of the material is 7 x 109 N/m2 . The area of cross section to support a load of 104 N is

The centre of mass of an extended body on the surface of the earth and its centre of gravity

"Heat cannot itself flow from a body at lower temperature to a body at higher temperature ". This statement corresponds to