Two small bar marnets are placed in a line with like poles facing each other at a certain distance d apart. If the length of each magnet is neglifible as compared to d, the force between them will be inversely proportional to

If two charges of 1 coulomb each are placed 1 km apart, then the force between them will be

Two charges are placed a certain distance apart in air. If a brass plate is introduced between them, the force between them will

It two charges of 1 coulomb each are placed 1 km apart,then the force between them will be

Two short magnets placed along the same axis with their like poles facing each other repel each other with a force which varies inversely as

Two charges are placed at a distance apart if a glas slab is placed between them force between them will

If the distance between two dissimilar magnetic poles held d cm apart be doubled, then the force of attraction between them will be:

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?