Two bar magnets are placed close to each other with their opposite poles facing each other. In absence of other forces, the magnets are pulled towards each other and their kinetc energy increases. Does it contradict our earlier knowledge that magnetic forces cannot do any work and hence cannot increase kinetic energy of a system?

When the north poles of two different magnets are placed near each other , then the force and when the north pole and the south pole are placed near each other the force of …….results.

A charge Q is place at each of the opposite corners of a square. A charge q is placed at each of the other two corners. If the net electrical force on q is zero, then q//Q equals:

If two bodies experience collision when they are moving opposite to each other .When does its total kinetic energy becomes zero ?

Two equal point charges Q=+sqrt(2) mu C are placed at each of the two opposite corners of a square and equal point charges q at each of the other two corners. What must be the value of q so that the resultant force on Q is zero?

The magnetic field lines of two bar magnets A and B are shown below : Name the poles of the magnets facing each other .

Like poles of bar magnet ...... each other and its unlike poles ...... each other.

Two small and similar bar magnets have magnetic dipole moment of 1.0 Am^(2) each. They are kept in a plane in such a way that their axes are perpendicular to each other. A line drawn through the axis of one magnet passes through the centre of other magnet. If the distance between their centers is 2 m, find the magnetic field at the mid point of the line joining their centers.

Two plane mirrors are placed parallel to each other at a distance L apart . A point object O is placed between them, at a distance L/3 from one mirror . Both mirrors form multiple images. The distance between any 'two images cannot be

Two conducting coils are kept parallel to each other so that they have a common axis as shown in the figure. Now a bar magnet moves with velocity vecv towards coil (2) as shown in figure, then _____

Two paricle A and B initially at rest, move towards each other under mutual force of attraction. At the instant when the speed of A is V and the speed of B is 2V, the speed of the centre of mass of the system is