Magnetic field and flux density

magnetic field formula

The magnetic field of larger magnets can be obtained by modeling them as a collection of a large number of small magnets called dipoles each having their own m. The magnetic interaction is described in terms of a vector fieldwhere each point in space and time is associated with a vector that determines what force a moving charge would experience at that point see Lorentz force.

magnetic field strength examples

The "magnetic flux density". If a ferromagnetic object such as a piece of iron is brought into a magnetic field, the "magnetic force" exerted on that object is directly proportional to the gradient of the magnetic field strength where the object is located.

Magnetic field intensity and magnetic flux density

Magnetic field lines are like streamlines in fluid flow , in that they represent something continuous, and a different resolution would show more or fewer lines. Now find a B that makes the Lorentz force law fit all these results—that is the magnetic field at the place in question. The bottom line is: most of the time, when you see "magnetic field", that's all you have to worry about. For instance, electrons spiraling around a field line produce synchrotron radiation that is detectable in radio waves. This was last updated in July Related Terms. First, measure the strength and direction of the magnetic field at a large number of locations or at every point in space. Sometimes, people will be very precise and talk about either the magnetic flux density or the magnetic field strength. And just using "magnetic field" is a lot simpler The total number of magnetic field lines penetrating an area is called the magnetic flux.

Since it is based on the fictitious idea of a magnetic charge density, the pole model has limitations. Alternatively, the magnetic field can be defined in terms of the torque it produces on a magnetic dipole see magnetic torque on permanent magnets below.

First, measure the strength and direction of the magnetic field at a large number of locations or at every point in space. If a magnetized object is divided in half, a new pole appears on the surface of each piece, so each has a pair of complementary poles.

For simple magnets, m points in the direction of a line drawn from the south to the north pole of the magnet.

magnetic flux formula in terms of current
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Magnetic field