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MHT-CET : Physics Entrance Exam

MHT - CET : Physics - Magnetism Know More

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  • The poles in a magnetic dipole have equal magnitude and are opposite in nature.
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The dimensions of pole strength

= M0L1T0A1

Magnetic dipole moment

= M0L2T0A1

Magnetic induction

= M1L0T-2A-1

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  • The poles of a magnet are fictitious points.
  • Magnetic lines of induction are assumed to originate at the N-pole and terminate at the S-pole.
  • Magnetic length of a magnet is less than its geometric length.
  • There is no effect of temperature on the magnetisation of diamagnetic substances.
  • For paramagnetic substances, magnetism is inversely proportional to absolute temperature.
  • In ferromagnetic substances, magnetisation decreases with temperature.
  • The volume of domains in ferromagnetic substances ranges from 10-2 cm3 to 10-6 cm3.
  • Magnetic dipole moment is a vector quantity and is directed from S-pole to N-pole.
  • A point that is equidistant from the two poles of a magnet lies on its equatorial line.
  • The magnetic potential at a point due to the N-pole is positive while due to the S-pole it is negative.
  • Magnetic lines of induction do not intersect each other.
  • Ferromagnetic substances retain magnetism even after being removed from the external magnetic field.
  • Beyond curie temperatures ferromagnetic substances are converted into paramagnetic substances.

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