What is the unit of magnetic permeability?

• Henry per meter (H/m)

• Tesla (T)

• Weber (Wb)

• Ampere (A)

Which of the following materials has the highest magnetic permeability?

• Diamagnetic materials

• Paramagnetic materials

• Ferromagnetic materials

• Non-magnetic materials

The permeability of free space (vacuum) is approximately:

• 1.257×10−6 H/m

• 3.14×10−7 H/m

• 9.81×10−6 H/m

• 0.5×10−7 H/m

Magnetic susceptibility (χm) is given by:

• χm=M/H

• χm=H/M

• χm=M/B

• χm=B/H

If a material has negative magnetic susceptibility, it is classified as:

• Paramagnetic

• Ferromagnetic

• Diamagnetic

• Ferrimagnetic

Magnetization (M) is defined as:

• The magnetic field applied to a material

• The measure of the ability of a material to conduct magnetic flux

• The magnetic dipole moment per unit volume

• The ratio of magnetic flux density to permeability

Which of the following is an example of a diamagnetic material?

• Iron

• Nickel

• Copper

• Cobalt

What type of material is weakly magnetized in the direction of the applied field?

• Diamagnetic

• Paramagnetic

• Ferromagnetic

• Ferrimagnetic

Which class of materials retains its magnetization even after the external field is removed?

• Paramagnetic

• Diamagnetic

• Ferromagnetic

• Non-magnetic

What is the fundamental reason for ferromagnetism in materials?

• Presence of unpaired electrons and strong exchange interactions

• Absence of magnetic dipoles

• High electrical conductivity

• Weak interaction of atomic dipoles