Electromagnetism

It is magnetism associated with electric charges that are moving such as the flow of electric current.

Electromagnetism

A type of magnet usually consist of wire wound into a coil in which magnetic field is produced by electric current.

Electromagnet

It is the production of electric current or voltage due to magnetism

Electromagnetic Induction

It is the force that tends to setup magnetic flux.

Magnetomotive force (mmf)

What is the formula for mmf?

What is the SI to CGS conversion of mmf?

1 At = 0.4*pi Gb

It is the magnetomotive force per unit length in a magnetic circuit

Magnetic Field Intensity

Magnetic field intensity can also be called?

Magnetizing force

What is the formula for magnetic field intensity?

What is the SI to CGS conversion of magnetic field intensity?

1 At/m = 4*pi x 10^-3 Oe

It is the measure of ease in which a given magnetic field can be established in a given material

Permeability

What is the formula for permeability?

A classification of magnetic material whose relative permeability is slightly less than 1

Diamagnetic

A classification of magnetic material whose relative permeability is slightly greater than 1

Paramagnetic

A classification of magnetic material whose relative permeability is very much greater than 1

Ferromagnetic

What are common ferromagnetic materials?

Iron, Nickel, and Cobalt

It is the opposiiton offered in a magnetic circuit to the flow of magnetic flux

Reluctance

What is the formula of reluctance?

What is the formula for reluctivity?

Wha is the ohm’s law for magnetic circuits?

It is the delayed reaction of the magnetization of a ferromagnetic material, with the change of magnetizing force

Magnetic Hysteresis

It is the magnetism left after the removal of magnetizing force

Residual Magnetism / Remanence

The ability of material to retain magnetism

Retentivity

It is the force required to counter retentivity and thus eliminating residual magnetism

Coercive Force

It is the intensity of the magnetic field needed to reduce the magnetization of a ferromagnetic material to zero

Coercivity

What law states that electromotive force is induced whenever a conductor cuts magnetic flux?

Faraday’s First Law

What law states that the magnitude of the induced EMF is proportional to the relative rate of change of magnetic flux?

Faraday’s Second Law

What is the formula of induced voltage according to Faraday’s Law of electromagnetic induction?

Explain Screw Rule

Explain Grip Rule for Solenoid

It is the concept whereby a small voltage is generated by a conductor with current in an external magnetic field

Hall Effect

This law states that in electromagnetic induction, the current setup by the induced voltage tends to create flux whose direction opposes any change in the existing flux

Lenz’s Law