Magnetism and M...

Three similar bar magnets are placed to form an equilateral triangle as shown in Fig. The magnetic moment of each magnet is M. What is the magnetic moment of the system?

A uniform magnetic needles is suspended from its centre by a thread. Its upper end is now loaded with a mass of 50 milligram, and the needle becomes horizontal. If the strength of each pole is 98.1 ab amp-cm and g = 981 cm/s², then the vertical component of earth’s magnetic induction is

A magnet 20 cm long with its poles concentrated at its ends is placed vertically with its north pole on the table. At a point due 20 cm south (magnetic) of the pole, a neutral point is obtained. If H = 0.3 gauss, then the pole strength of the magnet is approximately

An iron rod of length L and magnetic moment M is bent in the form of a semicircle. Now its magnetic moment will be

Unit of magnetic flux density (or magnetic induction) is

Magnetic intensity for an axial point due to a short bar magnet of magnetic moment M is given by

A magnetic dipole is placed in a uniform magnetic field. The net magnetic force on the dipole

If a magnet of pole strength m is divided into four parts such that the length and width of each part is half that of initial one, then the pole strength of each part will be

The distance of two points on the axis of a magnet from its centre is 10 cm and 20 cm respectively. The ratio of magnetic intensity at these points is 12.5 : 1. The length of the magnet will be

Ratio of magnetic intensities for an axial point and a point on broad side-on position at equal distance d from the centre of magnet will be or The magnetic field at a distance d from a short bar magnet in longitudinal and transverse positions are in the ratio