Kuis II (Magnetization and Dielectric Materials)

Basic source of magnetism ...

• Charged particles alone

• Magnetic dipoles

• Movement of charged particles

• Magnetic domains

Units for magnetic flux density ...

• Wb / m²

• Wb / A.m

• A / m

• Tesla / m

Magnetic permeability has units as ...

• Wb / A.m

• Tesla / m

• A / m

• Henry

Below the ferromagnetic curie temperature, the ferromagnetic material exhibit B-H whose form is ...

• straight line

• exponential curve

• B-H loop

• none of these

Magnetic susceptibility para-magnetic materials is ...

• +10^-5

• -10^-5

• 10⁵

• 10^-5 to 10^-2

Magnetic induction B and magnetic field intensity H are related by ...

• B = μ_o + μ_oH

• B = μ_oμ_rH

• B = μ_oH²

• B = μ_o + H

Example for ferro-magnetic materials ...

• super conductors

• alkali metals

• transition metals

• Ferrites

For paramagnetic materials, μ_r (relative permeability) at room temperature is

• 10

• 5

• 1

• 0

At curie temperature, the spontaneous magnetization for ferromagnetic material is ...

• zero

• 10

• infinite

• none of these

Which one of the following material does not have permanent magnetic dipoles ?

• ferromagnetic

• antiferromagnetic

• paramagnetic

• diamagnetic