Show that the force of attraction between two short magnets of moment m and m' with their centres d distance apart and their axes in the same direction along the same lines is `(mu_(0))/(4pi) (6mm')/(d^(4))`

Force of attraction between two point charges placed at a distance 'd' is F. What distance apart should they be kept in the same medium, so that the force between them is 2F ?

The force of attraction between two long parallel conductors 1 metre apart carrying unit ampere current in same direction is

In a medium, force of attraction b/w two-point charges distance d apart is F. What distance apart should these be kept in the same medium so that the force b/w them becomes 3F?

The gravitational force between two particles of masses m_(1) and m_(2) separeted by the same distance, then the gravitational force between them will be

Force of attraction between two point electric charges placed at a distance d in a medium is F . What distance apart should these be kept in the same medium, so that force between them becomes F//3 ?

Calculate the force acting between two small magnets, placed in end on position 0.1 m apart from their centres. (Given, magnetic moment of each magnet is 5 Am^(2) ).

What is the magnetic induction due to a short bar magnet of moment of 0.5 Am^(2) at a point along its axis at a distance of 20 cm from the centre of the magnet? (mu_(0)/(4pi)=10^(-7)" SI unit")

The force of attraction between two bodies kept in air at a certain distance apart is F. If they ae now kept in water at the same distace apart, what will be the force of attraction between them?

The force of repulsion between two electrons at a certain distance is F. The force between two protons separated by the same distance is (m_(p)=1836 m_(e))

The force of attraction between two point magnetic poles is directly proportional to the product of their pole strengths and inversely proportional to the square of the distance between them. i.e. F prop (m_(1)m_(2))/(d^(2)) rArr F= (Km_(1)m_(2))/(d^(2)) . Where K is a constant, m_(1) and m_(2) are pole strengths and 'd' is the distance between them. This is called Coulomb's law Using the above information, answer the following questions. The force between two poles (m_(1) and m_(2)) in air which are separated by a distance 'd' is F. If the distance is doubled, the force between the poles in air now is ____