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As shown in the figure, P and Q are two coaxial conducting loops separated by some distance. When the switch S is closed, a clockwise current flows in P (as seen by E) and an induced current

When switch S is closed magnetic field lines passing through Q increases in the direction from right to left. So, according to Lenz’s law... View Article

Which of the following statements is not true for polar molecules?

The oxygen and hydrogen molecules are non-polar molecules.... View Article

Capacitor _________ dc flowing through it.

Capacitor doesn’t allow dc to flow through it.... View Article

Motional emf is emf induced

across the ends of a wire moving in a magnetic field.... View Article

In a current carrying conductor varying electric field generates

In a current-carrying conductor, by varying the electric current, the magnetic field is generated. The direction of the magnetic field generated... View Article

The polarized dielectric is equivalent to

Two charged surfaces are created and these have equal and opposite charge densities.... View Article

The unit of self inductance of a coil is?

The self-inductance of a coil is defined as the ratio of self-induced emf to the rate of change of current in the coil. The unit used for... View Article

Explain different ways to induce the current in a coil.

The different ways to induce current in a coil are as follows: 1. If a coil is moved rapidly between the two poles of a horse-shoe magnet, then... View Article

Which region (or regions) carries a net charge of the greatest magnitude?

Since all field lines are going out from (iii) so the net flux is largest in this case. In case (i) and (ii) some of the field lines are going in... View Article

Five forces are separately applied to a flat object lying on a table of negligible friction as shown in figure. The force which will not cause the object to rotate about the centre of the object is

The line of action of F2 passes through the centre of rotation, and thus cannot produce a torque about the centre (r = 0).... View Article

The figure shows a dish kept at an orientation with a marble placed on it. If the marble in figure is displaced slightly, it would rattle about for a while and come to rest in its original place. This is an example of :

If a dish is kept at an orientation with a marble placed on it and if the marble in figure is displaced slightly, it would rattle about for a... View Article

Two vessels with equal base and unequal height have water filled to same height. The force at the base of the vessels is

Force at the bases of two vessels will be equal as force depends on height and area. Since it is same here, force is equal.... View Article

Two identical rectangular strips, one of copper and the other of steel, are riveted as shown to form a bi-metal strip. On heating, the bi-metal strip will

On heating, the copper strip will suffer greater elongation and hence the bimetal strip will bend with the steel strip on the concave side. ... View Article

The graph represents the velocity time for the first 4 seconds of motion. Find the distance covered

The distance covered = area under the curve = (1/2) x 4 x 4 = 8 m... View Article

If we choose the upward direction as positive which of the following graphs correctly represents the acceleration of a freely falling body?

A since upward direction is given as positive the downward direction will be negative. All throughout the acceleration remains -9.8m/s2. A person... View Article

The displacement-time graph shows the following:

An object starting from s = 10 m and having constant positive velocity.... View Article

Suppose two systems X and Y are separated by adiabatic wall and both are in contact with another system Z separated by a conducting wall as shown in the figure below. Let the temperatures of the three systems be Tx, Ty and Tz . It is given that Tx= Tz and Ty = Tz then what would be the relation between Tx and Ty?

Tx=Ty according to Zeroth law of thermodynamics.... View Article

A motorcycle and a truck are both moving in the same direction in adjacent lanes on a highway. At a particular instant, the speed of motorcycle is four times as large as the speed of truck v. At that instant, motorcycle is accelerating forward while the truck is moving at a constant velocity. Which one of the following statements best describes which vehicle has a larger momentum at that instant?

Momentum is mass times velocity, and the mass is not given. However, the truck would have a larger momentum if the mass of the truck were more... View Article

In which direction should the boy apply the force, in order to stop a trolley sliding downward on the staircase?

The boy has to apply a force in the upward direction, to stop it. If you apply a downward force, the trolley will further slide down and will not stop.... View Article

What is earthing and grounding means?

Earthing is done by providing an earth wire from the device to the ground. if an earth wire is provided, it ensures a very low resistance path... View Article

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