The force experienced by the cathode rays when they pass through an electric field of intensity E → is
1 Crore+ students have signed up on EduRev. Have you? Download the App |
If a particle is constrained to move in a vertical plane along the smooth arc of a vertical cycloid with vertex downwards, then the motion of the particle will be—
A 5.0 μF capacitor is charged to a potential difference of 800 V and discharged through a conductor. The energy given to the conductor during the discharge is
An inductance L having a resistance R is connected to an alternating source of angular frequency ω. The quality factor (Q) of the inductance is L/R
The average e.m.f. induced in a coil in which a current changes from 0 to 2 A in 0.05 s is 8 V. The self inductance of the coil is
A cell can be balanced against 110 cm and 100 cm of potentiometer wire , respectively with and without being short circuited through a resistance of 10 Ω. Its internal resistance is
The resistance of a coil at 100oC is 4.2 Ω. If temperature coefficient of resistance of the coil material is 0.004oC-1, then its resistance at 0oC is
Three small spheres each carrying a positive charge Q, are placed on the circumference of a circle of radius 'r' to form an equilateral triangle. The electric field intensity at the centre of the circle will be
Figure show three circular arcs, each of radius R and total charge as indicated. The net electric potential at the centre of curvature is:
At what height from the earth surface, the acceleration of gravity will be half of the surface of the earth?
A 60 kg weight is dragged on a horizontal surface by a rope to 2 metres. If coefficient of friction is μ = 0.5, the angle of rope with the surface is 60o and g = 9.8 m/sec2, then work done is
An artificial satellite stays in the orbit of the earth because
A partition wall has two layers A and B in contact, each made of different material. They have the same thickness but the thermal conductivity of layer A is twice that of layer B. If the steady state temperature difference across the wall is 60 K, then the corresponding difference across the layer A is
Which of the following is conserved, when light waves interfere with each other?
An electron moves in a circular orbit with a uniform velocity v. It produces a magentic field B at the centre of the circle. The radius of the circle is proportional to
If a long hollow copper pipe carries a current then magnetic field produced will be
The magnitude of magnetic field at a point due to a current-carrying small element does not depend upon
When a diamagnetic substance is brought near north or south pole of a bar magnet is
If a material, placed in a magnetic field is thrown out of it, then the material is
If number of turns, area and current through a coli is given by n, A and I respectively, then its magnetic moment will be
A square plate of 0.1 m side moves parallel to another plate with a velocity of 0.1 m s-1, both plates being immersed in viscous liquid. If the viscous force is 0.02 N and the coefficient of viscosity is 1 poise, then distance between the plates is
Two pieces of a glass plate, placed one upon the other with a little water in between them, can not be separated easily, because of
Which of the following affets the elasticity of a substance?
Moment of inertia of a thin circular disc of mass M and radius R about any diameter is
A body falling for seconds covers a distance S equal to that covered in next second. Taking g = 10m/s2,S=
A boy sitting on the topmost berth in the compartment of a train which is just going to stop on a railway station, drops an apple aiming at the open hand of his brother sitting vertically below his hands at a distance of about 2 metre. The apple will fall