If you want direction of magnetic moment of a magnetic needle or bar magnet then arrange them such that they can rotate freely in horizontal plane. Which describes the components of an electron's spin angular momentum and spin magnetic dipole moment on a z axis?

magnetic field; that is, the magnet acts as a compass and aligns itself north-south. A proton possesses a magnetic dipole moment and has a half-integer nuclear spin, I = ½. An alternative and more quantitatively useful definition of the magnetic moment is to model it as arising from a tiny current traveling around the edge of a loop of cross sectional area ().The magnetic dipole moment (µ) is a vector defined as µ = i A whose direction … A magnetic dipole is a magnetic north pole and a magnetic south pole separated by a small distance. Magnetic dipole moments have sizes of current time’s region or energy separated by magnetic flux density. The magnetic moment may be considered to be a vector having a magnitude and direction. Repulsion or attraction between two magnetic dipoles. It is repulsive if the currents are in opposite directions. The unit for dipole moment in centimeter–gram–second electromagnetic system, in meter–kilogram– second–ampere is an ampere-square meter, is the erg (unit of energy) per gauss (unit of magnetic flux density). In the presence of an external magnetic field, the magnetic dipole moment aligns either parallel or anti-parallel to the direction of B 0.As shown in Fig. a Both components are quantized. The magnetic field produced by the magnet is proportional to its magnetic moment. The direction of the dipole moment, which may be represented mathematically as a vector, is perpendicularly away from the side of the surface enclosed by the counterclockwise path of positive charge flow.

c Only the component of the spin magnetic dipole moment is quantized. Considering the current …

When a magnetic dipole is considered as a current loop, the magnitude of the dipole moment is proportional to the current multiplied by the size of the enclosed area. Magnetic dipole moments have dimensions of current times area or energy divided by magnetic flux density. The period of the oscillation depends on the magnetic dipole moment of the The unit for dipole moment in metre–kilogram– second–ampere is ampere … Magnetic Dipole Moment From the expression for the torque on a current loop , the characteristics of the current loop are summarized in its magnetic moment The magnetic moment can be considered to be a vector quantity with direction perpendicular to the current loop in the right-hand-rule direction. The direction of the magnetic moment points from the south to north pole of the magnet.

A magnetic dipole is the limit of either a closed loop of electric current or a pair of poles as the size [clarification needed] of the source is reduced to zero while keeping the magnetic moment constant. Objects tend to place themselves in such a way that the magnetic moment vector then becomes parallel to the magnetic field lines. A bar magnet is oriented with its magnetic dipole moment at 31.5° to the direction of a 0.0783-T magnetic field, causing a torque of 0.00487 Nm to act on it. The direction of μ makes an angle of 60 o with the x-axis.

The magnetic moment is the magnetic moment per turn, times the number of turns, μ = NabI. Details of the calculation: The magnitude of the torque is τ = N ab IB sin60 o = 100(0.4)(0.3)(1.2)(0.8)(0.866) Nm = 9.98 Nm. The force between two wires, each of which carries a current, can be understood from the interaction of one of the currents with the magnetic field produced by the other current.

It is a magnetic analogue of the electric dipole, but the analogy is not perfect.In particular, a magnetic monopole, the magnetic analogue of an electric charge, has never been observed. b Only the component of the spin angular momentum is quantized.


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