Magnetism

Magnetism

It is the property of material to repel or attract other magnetic materials

like poles repel, unlike poles attract

What is the fundamental law of magnetism?

Natural Magnet

A type of magnet that exhibits permanent magnetism

Artificial Magnet

A type of magnet produced by exposing a magnetic material into magnetizing force

Permanent Magnet

Magnet that is hard to demagnetize

Temporary Magnet

Magnet that is easy to demagnetize

Coercivity / Coercive Force

It is the resistance of material to becoming demagnetized

High

What is the retentivity of permanent magnets?

Low

What is the retentivity of temporary magnets?

High

What is the magnetic hysteresis of permanent magnets?

Low

What is the magnetic hysteresis of temporary magnets?

Permanent Magnet

The applications of this type of magnet are meters, headphones, loudspeakers, and radar transmitting tubes.

Temporary Magnet

The applications of this type of magnet are transformers, chokes, relays, and circuit breakers.

Magnetic Flux

It is the total number of magnetic lines of force leaving or entering the pole.

Weber (Wb)

What is the SI unit of magnetic flux?

Maxwell (Mx)

What is the CGS unit of magnetic flux?

1 Wb = 10^8 Mx

1 Mx = 1 lines of force

What is the conversion of weber to maxwell?

Flux Density

It is the number of magnetic field lines per unit area perpendicular to direction of flux.

What is the formula for flux density?

Wb / m²

Tesla (T)

What is the SI unit of flux density?

Mx / cm²

Gauss (G)

What is the CGS unit of flux density?

1 T = 10^4 G

What is the conversion of tesla to gauss?