Two short bar magnets apply a force F on each other.If the separation between them is made "1/3 times,new force between them becomes NF.Find nearest integer value of N

When distance between two given magnetic poles is halved, force between them becoems k times, where k=

Two point charges separated by a distance d repel each other with a force of 9N. If the separation between them becomes 3d, the force of repulsion will be

If distance between the two bodies is doubled.then the gravitational force between them will become

Two electrons move parallel to each other with equal speed 'V' the ratio of magnetic & electric force between them is

Two charges of equal magnitudes and at a distance r exert a force F on each other. If the charges are halved and distance between them is doubled, then the new force acting on each charge is

The gravitational force between two object is 100N. How should the distance between these object be changed so that force between them becomes 50N.