Question:

The unit of magnetic moment is

Updated On: Jun 23, 2023
  • $ A-{{m}^{2}} $
  • A-m
  • $ A-{{m}^{3}} $
  • $ kg-{{m}^{3}} $
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The Correct Option is A

Solution and Explanation

Magnetic moment $ (M)=NIA $ where $ N= $ number of turn, $ I= $ electron current, $ A= $ area of cross-section of the coil $ \therefore $ Unit of magnetic moment $ =A-{{m}^{2}} $
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Concepts Used:

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.