Magnetism and M...

Rate of change of torque τ with deflection θ is maximum for a magnet suspended freely in a uniform magnetic field of induction B, when

A magnet of magnetic moment M is rotated through 360° in a magnetic field H. The work done will be

The work done in turning a magnet of magnetic moment ‘M’ by an angle of 90° from the meridian is \'n\' times the corresponding work done to turn in through an angle of 60°, where \'n\' is given by

Force between two identical bar magnets whose centres are r metre apart is 4.8 N, when their axes are in the same line. If separation is increased to 2r, the force between them is reduced to

A bar magnet of magnetic moment 10⁴J/T is free to rotate in a horizontal plane. The work done in rotating the magnet slowly from a direction parallel to a horizontal magnetic field of 4 × 10^–5 T to a direction 60° from the field will be

Magnetic lines of force due to a bar magnet do not intersect because

A permanent magnet

Two equal bar magnets are kept as shown in the figure. The direction of resultant magnetic field, indicated by arrow head at the point P is (approximately)

A short bar magnet placed with its axis at 30o with a uniform external magnetic field of 0.16 tesla experiences a torque of magnitude 0.032 joule. The magnetic moment of the bar magnet will be

The magnetic field due to a small magnetic dipole of magnetic moment M, at distance r from the centre on the equatorial line is given by (in M.K.S. system)