Magnetic dipole moments

  • #1

Main Question or Discussion Point

Is the magnetic dipole moment, the torque a material experiences when its placed in an external magnetic field?
I know that the magnetic dipole moment for a current carrying wire is U=IA.
The dipole moment is in the same direction of the Area, does this mean that the force it experiences will be in this direction when placed in an external magnetic field?
Where can i find the derivation of this formula?


Basically i just need help understand what the magnetic dipole actually is, i know its the current surrounding an area, but what significance is this? Why did it deserve a symbol?

Can anyone explain whats happening in this video as well please?

Thanks
 
Last edited:

Answers and Replies

  • #2
anyone?
 
  • #3
dlgoff
Science Advisor
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The dipole moment is in the same direction of the Area, does this mean that the force it experiences will be in this direction when placed in an external magnetic field?
No. The torque acts in a direction perpendicular to the magnetic moment (i.e. τ = μ X B). This is what causes the precession. Note that τ = μ X B is the vector cross product operation.
 

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