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Magnetism

Comparison between Electrical and Magnetic Circuits

The most important differences between Electrical Circuit and Magnetic Circuit are discussed in this article on the basis of Exciting Force, Current & Flux Density, Lines of Force, Series & Parallel Circuit Behavior, Insulation, Energy, Temperature, and Circuits Representation. The following table keys out the main Differences between Electric and Magnetic …

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Hysteresis Loss | Eddy Current and Core Losses

The area within the hysteresis loop is a product of B and H and this area represents the energy per unit volume that must be used per magnetization cycle to move the domains.  Hysteresis Loss With appropriate constants, the hysteresis loss can be given in watts per unit volume. An …

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Hysteresis Loop | Magnetization Curve

A curve, or loop, plotted on B-H coordinates showing how the magnetization of a ferromagnetic material varies when subjected to a periodically reversing magnetic field, is known as Hysteresis Loop. Hysteresis Definition Hysteresis is the lagging of the magnetization of a ferromagnetic material behind the magnetizing force H. By using …

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Absolute and Relative Magnetic Permeability

Permeability is the measure of the ease, with which magnetic lines of force pass through a given material. The ability of a material to concentrate magnetic flux is called permeability and its symbol is the Greek lower case letter μ. Any material that is easily magnetized tends to concentrate magnetic …

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Magnetic Field Intensity | Definition Formula

Magnetomotive force, ℑ , per unit length, is called the magnetic field intensity H. Magnetic Field Intensity Unit Magnetic field intensity is also known as the magnetizing force which is measured is ampere-turns per meter (A-t/m). Of primary concern, however, is the magnetomotive force needed to establish a certain flux density, …

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Magnetic Flux Density | Definition and Formula

Magnetic Flux Density Flux density is the measure of the number of magnetic lines of force per unit of cross-sectional area. While the total amount of the flux produced by a magnet is important, we are more interested in how dense or concentrated, the flux is per unit of cross-sectional …

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Magnetic Flux Definition and Unit

Magnetic Flux is defined as; “a total number of lines of magnetic force passing through any surface placed perpendicular to the magnetic field. It is denoted by φ (Greek Letters Phi). Magnetic Flux Formula The magnetic flux is also defined as the dot product of magnetic field B and vector Area …

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Magnetomotive Force (MMF) Definition

Magnetomotive force is defined as, “The force produced by current through a coil of wire is called magnetomotive force (mmf), as shown in the following figure. It is the force by which a magnetic field is produced. Just as an increase in electromotive force produces more current in a circuit, …

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Magnetic Force on a Current Carrying Conductor

A current carrying conductor produces its own magnetic field. Such a conductor is placed in a magnetic field. The magnetic field of the conductor will interact with the external magnetic field. As a result of which the conductor may experience a force. It can be observed by the following experiment. …

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Magnetic lines of Force | Magnetic Field

When current flows in a wire, it creates a magnetic effect around the wire which is called magnetic field. The magnetic field is specified by a direction as well as a magnitude. The following figure shows a magnetic field, of a bar magnet, by field lines that originate from the …

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Magnetism

Magnetism is a property associated with materials that attract iron and iron alloys. The science of magnetism probably began with early Greeks. From that time to the present many recognized the physical effects of magnetism, yet until this century, no one understood why certain materials were a magnet. Presently it …

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