The density of the lines (number of lines per millimeter) and direction of the lines illustrate that the magnetic field is a vector field. Each particle quickly becomes magnetized with its own north and south poles, and because their opposite poles attract, they form lines representing the magnetic field. The magnetic field associated with a permanent magnet can be demonstrated by placing a sheet of paper over the magnet and randomly sprinkling iron filings on the paper. Iron filings form magnetomagnetic lines of force. A magnetic monopole has never been discovered.
If you cut a bar magnet in half to make two shorter bar magnets, each of the new magnets has north and south poles. The amount of magnetic force induced depends upon the strength of H and the nature of the medium.Ī magnetized body has a north and south pole, and these poles always exist in associated pairs. Magnetic flux density (B in tesla or Weber/m 2) is the amount of magnetic force induced on the given body due to the magnetizing force H. This force is directly proportional to current carried by a conductor and the length of the conductor. But there are subtle ways in which the forces correspond only roughly, and comparisons are imperfect.Īnother way to put it is that magnetic field strength (H in amperes per meter) is the amount of magnetizing force.
Resistance and its reciprocal, conductance, in an electrical circuit corresponds to reluctance and its reciprocal, permeance, in a magnet circuit.
Electromotive force in an electrical circuit corresponds to magnetomotive force. A magnetic circuit is analogous to an electrical circuit with important differences. Simply stated, a magnetic field is analogous to electrical voltage, while magnetic flux is analogous to electrical current.
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