Magnetic properties of materials- I
... • These dipoles might align when an external electric field is applied. • An electron circulating about the nucleus can be considered as a current loop of radius r and speed v. ...
... • These dipoles might align when an external electric field is applied. • An electron circulating about the nucleus can be considered as a current loop of radius r and speed v. ...
PPT
... • Changing electric fields produce (induce) magnetic fields: displacement currents. •Maxwell’s laws allow us to calculate electric and magnetic fields everywhere in space if we are given the sources: electric charges and currents. • If there are no sources, we can still have electric and magnetic fi ...
... • Changing electric fields produce (induce) magnetic fields: displacement currents. •Maxwell’s laws allow us to calculate electric and magnetic fields everywhere in space if we are given the sources: electric charges and currents. • If there are no sources, we can still have electric and magnetic fi ...
`magnetic field`.
... If you were to split a magnet in two, you would end with two magnets, each with a north and south pole. True even to the atomic level! ...
... If you were to split a magnet in two, you would end with two magnets, each with a north and south pole. True even to the atomic level! ...
... Consider a system of N non-interacting spins of moment m in an external magnetic field H, temperature . The spin magnetic moment can be either 'up' or 'down'. a. What are the possible energies of such a spin in the field H? b. Find the partition function of one spin c. Find the partition function ...
Magnetic Fields
... Devices that use mechanical energy to induce an electric current are called generators. Many kinds of mechanical energy can therefore by converted into electrical energy such as in: hydro-electric and ...
... Devices that use mechanical energy to induce an electric current are called generators. Many kinds of mechanical energy can therefore by converted into electrical energy such as in: hydro-electric and ...
Force between magnets
Magnets exert forces and torques on each other due to the complex rules of electromagnetism. The forces of attraction field of magnets are due to microscopic currents of electrically charged electrons orbiting nuclei and the intrinsic magnetism of fundamental particles (such as electrons) that make up the material. Both of these are modeled quite well as tiny loops of current called magnetic dipoles that produce their own magnetic field and are affected by external magnetic fields. The most elementary force between magnets, therefore, is the magnetic dipole–dipole interaction. If all of the magnetic dipoles that make up two magnets are known then the net force on both magnets can be determined by summing up all these interactions between the dipoles of the first magnet and that of the second.It is always more convenient to model the force between two magnets as being due to forces between magnetic poles having magnetic charges 'smeared' over them. Such a model fails to account for many important properties of magnetism such as the relationship between angular momentum and magnetic dipoles. Further, magnetic charge does not exist. This model works quite well, though, in predicting the forces between simple magnets where good models of how the 'magnetic charge' is distributed is available.