Magnetic Materi...

When iron filings are sprinkled on a sheet of glass placed over a short bar magnet then,

Diamagnetic substances are

A cube-shaped permanent magnet is made of a ferromagnetic material with a magnetization 8 * 10⁵ M of about The side length is 2 cm. Magnetic field due to the magnet at a point 10 cm from the magnet along its axis is

A bar magnet of magnetic moment 1.5 J/T lies parallel to the direction of a uniform magnetic field of 0.22 T. What is the torque acting on it?

A short bar magnet of magnetic moment  5.25 ×10⁻² JT⁻¹  is placed with its axis perpendicular to the earth ’s field direction. At what distance from the centre of the magnet, the resultant field is inclined at  45  with earth ’s field on its normal bisector . Magnitude of the earth ’s field at the place is given to be 0.42 G. Ignore the length of the magnet in comparison to the distances involved.

Which of the following statements about magnetic field lines true?

For diamagnetic materials

permeability of a paramagnetic material is expected to decrease with increasing temperature because

A magnetic needle free to rotate in a vertical plane parallel to the magnetic meridian has its north tip pointing down at  220  with the horizontal. The horizontal component of the earth ’s magnetic field at the place is known to be 0.35 G. Determine the magnitude of the earth ’s magnetic field at the place.

A Rowland ring of mean radius 15 cm has 3500 turns of wire wound on a ferromagnetic core of relative permeability 800. What is the magnetic field B in the core for a magnetising current of  12 A ?