4.1 Module summary

The centres of magnetic force in a bar magnet are located near the ends of the magnet and are known as the poles of the magnet. Two unlike poles attract each other and two poles of the same polarity repel each other. At any point (x, y, z) the magnetic field B (x, y, z) relates the magnetic force F_mag on a moving charged particle to the charge q of the particle and its velocity ?. The direction of the field at any point indicates the direction in which an isolated north magnetic pole placed at that point would tend to move (or the direction in which the north pole of a freely suspended compass needle would point). The magnitude of the field at any point may be determined by measuring the magnitude F_mag of the magnetic force that would act on a particle of charge q as it moves through the point (x, y, z), in a direction at right angles to the magnetic field, with a speed ?_?

A simple malfunction of your Earths magnetized occupation would be the fact it is much like the industry of a club magnet, founded in a way that its magnetic southern rod factors towards Earths geographical North Pole.

A charismatic community can be portrayed from the profession traces. For example traces is pulled therefore the industry is tangential so you’re able to industry line at any part and has now the same direction because career line at that time. The fresh occurrence of your own community outlines in any part try proportional into the magnitude of magnetized job for the reason that region. (Used which history requirements might be overlooked, with regard to ease.) Plots of one’s community models of several orientations and you can plans regarding magnets exists having fun with a compass needle. (more…)