Chapter 16: Electromagnetic Induction
... Construction: An electric motor consists of a rectangular coil ABCD of insulated copper wire, wound on a soft iron core. The coil is mounted between the concave cylindrical poles of a permanent magnet in such a way that it can rotate between the poles N and S. The two ends of coil are connected to t ...
... Construction: An electric motor consists of a rectangular coil ABCD of insulated copper wire, wound on a soft iron core. The coil is mounted between the concave cylindrical poles of a permanent magnet in such a way that it can rotate between the poles N and S. The two ends of coil are connected to t ...
James Ruse Trial with Solutions
... A charged particle is injected into a region of uniform magnetic field and travels in a circular arc. If the particle were to be injected with a greater speed, what would be true of the magnetic force on it and the radius of its path? ...
... A charged particle is injected into a region of uniform magnetic field and travels in a circular arc. If the particle were to be injected with a greater speed, what would be true of the magnetic force on it and the radius of its path? ...
Backward-wave regime and negative refraction in chiral composites
... Another possibility is to construct a regular lattice of symmetrically positioned inclusions, so that the overall response is isotropic. In both cases the scattering losses from individual inclusions are supposed to be compensated, and the material can have rather low loss factor, determined only by ...
... Another possibility is to construct a regular lattice of symmetrically positioned inclusions, so that the overall response is isotropic. In both cases the scattering losses from individual inclusions are supposed to be compensated, and the material can have rather low loss factor, determined only by ...
Resources
... B. A magnetic field causes domains to align. C. The domains cannot return to random alignment after a magnetic field is removed. D. Randomly aligned domains cannot be aligned. To return to the chapter summary click Escape or close this document. ...
... B. A magnetic field causes domains to align. C. The domains cannot return to random alignment after a magnetic field is removed. D. Randomly aligned domains cannot be aligned. To return to the chapter summary click Escape or close this document. ...
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.