Magnetism and M...

The magnetic induction in air at a distance d from an isolated point pole of strength m unit will be

A magnetic needle lying parallel to a magnetic field requires W units of work to turn it through 60°. The torque required to maintain the needle in this position will be

A long magnetic neddle of length 2L, magnetic moment M and pole strength m units is broken into two pieces at the middle. The magnetic moment and pole strength of each piece will be

Two identical thin bar magnets each of length l and pole strength m are placed at right angle to each other with north pole of one touching south pole of the other. Magnetic moment of the system is

A small bar magnet has a magnetic moment 1.2 A-m². The magnetic field at a distance 0.1 m on its axis will be: (µ₀ = 4 π × 10^–4 T-m/A)

What happens to the force between magnetic poles when their pole strength and the distance between them are both doubled

The magnetic potential at a point on the axial line of a bar magnet of dipole moment M is V. What is the magnetic potential due to a bar magnet of dipole moment M/4 at the same point

A small bar magnet of moment M is placed in a uniform field H . If magnet makes an angle of 30° with field, the torque acting on the magnet is

Two small magnets each of magnetic moment 10 A-m² are placed in end-on position 0.1 m apart from their centres. The force acting between them is

Magnetic lines of force