PHY4308 - Magnetic Particle Testing

Which of the following permanent magnet type has the magnetic field leakage?

• U Shape

• Straight

• Circular

Magnetic flux density is always proportional to the magnetic field.

• True

• False

_______is one of the factors that affect magnetic flux density of solenoid.

• Number of turns

• Current flowing

• Radius of the loop

Permeability is the ratio of magnetic flux density to magnetic field

• True

• False

Stronger external magnetic field will increase the magnetization

• True

• False

Magnetic field exists inside the ferromagnetic materials.

• True

• False

Paramagnetic materials contains negative permeability

• True

• False

Retentivity exists when ______

• applied magnetic field is removed

• magnetization exists

• coercive force presents

The width of minimum and maximum applied magnetic field to ferromagnetic materials during zero flux density is equal to ___________.

• half of coercive force

• retentivity

• coercive force

• half of retentivity

Magnetization can be nullified by _______ the applied magnetic field.

• reversing

• increasing

• removing

• keeping constant