Explain the following: When two pins are hung by their heads from the same pole of a magnet, their pointed ends move apart.

Explain the following: Several soft iron pins can cling, one below the other, from the pole of a magnet.

When two spring balances joined at their free ends, are pulled apart, both show the same reading. Explain.

A pole on the ground lenses 60^(@) to the vertical. At a point a meters away from the base of the pole on the ground, the two halves of the pole subtend the same angle. If the pole and the point are in the same vertical plane, the length of the pole is

Explain the following: The north end of a freely suspended magnetic needle gets attracted towards a piece of soft iron placed a little distance away from the needle.

Explain the Why is one end of drawing board pin broad and flat, whereas its other end is pointed and sharp?

Show that the force on a wire between a and b of arbitrary of figure is the same as force on the straigth wire between the same two points when they carry the same current from a to b and are plassed in the same magnetic field. Also find the force.

The force of repulsion between two point charges is F, when these are at a distance of 1 m apart Now the point charges are replaced by spheres of radii 25 cm having the same charge as that of point charge and same distance apart. Then the new force of repulsion will

The magnetic moments of two bar magnets of same size are in the ratio 1:2. When they are placed one over the other with their similar poles together, then their perlod of oscillation in a magnetic field is 3s. If one of the magnets is reversed, then the period of oscillation in the same field will be q

Complete the following sentence : The neutral points of a bar magnet kept with its north pole pointing towards geographic north are located …………………….

Let 10 vertical poles standing at equal distances on a straight line , subtend the same angle of elevation alpha at a point O on this line and all the poles are on the same side of O. If the height of the longest pole is h and the distance of foot the smallest pole form O is alpha then the distance between two consecutive poles, is