Magnetic dipole Definition and 8 Discussions

A magnetic dipole is the limit of either a closed loop of electric current or a pair of poles as the size of the source is reduced to zero while keeping the magnetic moment constant. It is a magnetic analogue of the electric dipole, but the analogy is not perfect. In particular, a true magnetic monopole, the magnetic analogue of an electric charge, has never been observed in nature. However, magnetic monopole quasiparticles have been observed as emergent properties of certain condensed matter systems. Moreover, one form of magnetic dipole moment is associated with a fundamental quantum property—the spin of elementary particles.
The magnetic field around any magnetic source looks increasingly like the field of a magnetic dipole as the distance from the source increases.

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  1. sergiokapone

    I Rotating magnet levitation

    Is any physical explanation of this effect?
  2. peroAlex

    Induced Voltage of Rotating Circular Loop

    HI! I'm a student, this question appeared in one of the old tests. I though I had it solved but apparently I must have missed somewhere. Could someone please at least hint me where I went wrong? Homework Statement Thin wire is wound into circular frame with radius ## r = 0.05m ## which...
  3. B

    Magnetic Dipole Field from a Loop of Wire

    I am trying to understand the magnetic dipole field via loop of wire. The above pictures show how this problem is typically setup and how the field lines are typically shown. The math is messy but every textbook yields the following: β = ∇xA = (m / (4⋅π⋅R3)) ⋅ (2⋅cos(θ) r + sin(θ) θ) The...
  4. N

    Magnetic Torque on Dipole; Oscillating Magnet question

    Homework Statement A cylindrical bar magnet whose mass is 0.08 kg, diameter is 1 cm, length is 3 cm, and whose magnetic dipole moment is <5, 0, 0> A · m2 is suspended on a low-friction pivot in a region where external coils apply a magnetic field of <1.4,0,0> T You rotate the bar magnet...
  5. enerieire

    Magnetic dipole

    does anyone knows where this formula comes from? μ=½B(R^3) I am considering a sphere of radius R, with B its magnetic field. Who is μ? Thanks
  6. R

    Forces acting on bar magnet inside a charged solenoid

    This is not a specific homework problem. It is a lack of understanding in theory relating to a lab report I have to write. We (my group and I) wrapped a 40 cm PVC pipe in copper wire (very densely and for almost the entire length), applied a current to it, and dropped a permanent magnet...
  7. JGBuck94

    Magnetic moment between 2 bar magnets

    Homework Statement A bar magnet floats above another bar magnet. The first has mass u1 and magnetic moment m1=m1k^ and is on the ground. The second has mass u2 and mag. moment m2=-m2k^ and is a distance z above the ground, find z 2. Homework Equations I assume I need to calculate the magnetic...
  8. fricke

    Magnetic field due to magnetic dipole

    It is NOT a homework question. I am doing my revision and get stuck at this question. I am confused with the angle θ shown in this link: Professor who wrote this solution stated that θ is the angle between unit vector z and unit vector...