Question:

A short bar magnet of magnetic moment $0.4\, J\, T^{-1}$ is placed in a uniform magnetic field of 0.16 T. The magnet is in stable equilibrium when the potential energy is

Updated On: Jun 23, 2023
  • $-0.064\,J $
  • zero
  • $-0.082\,J $
  • $0.064\,J $
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The Correct Option is A

Solution and Explanation

Here, $M=0.4\,J\,T^{-1}; B=0.16\,T$ For stable equilibrium, the potential energy (U) of bar magnet in the magnetic field is $U = -MB = -0.4 ? 0.16 = -0.064 \,J$
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Notes on Magnetism and matter

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.