Question:

For an isotropic medium $B,\, \mu,\, H$ and $M$ are related as (where $B,\, \mu_{0},\, H$ and $M$ have their usual meaning in the context of magnetic material :

Updated On: Jun 23, 2023
  • $(B-M)=\mu_{0} H$
  • $M=\mu_{0}(H+M)$
  • $H=\mu_{0}(H+M)$
  • $B=\mu_{0}(H+M)$
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The Correct Option is D

Solution and Explanation

When a magnetic material is placed in a magnetic field, the magnetic material gets more magnetised. Hence, the net magnetic field is given by, $B =B_{0}+B_{m}=\mu_{0} H+\mu_{0} M$ $=\mu_{0}(H+M)$
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Magnetism & Matter

Magnets are used in many devices like electric bells, telephones, radio, loudspeakers, motors, fans, screwdrivers, lifting heavy iron loads, super-fast trains, especially in foreign countries, refrigerators, etc.

Magnetite is the world’s first magnet. This is also called a natural magnet.  Though magnets occur naturally, we can also impart magnetic properties to a substance. It would be an artificial magnet in that case.

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Some of the properties of the magnetic field lines are:

  • The lines and continuous and outside the magnet, the field lines originate from the North pole and terminate at the South pole
  • They form closed loops traversing inside the magnet. 
  • But here the lines seem to originate from the South pole and terminate at the North pole to form closed loops.
  • More number of close lines indicate a stronger magnetic field
  • The lines do not intersect each other
  • The tangent drawn at the field line gives the direction of the field at that point.