Test: Permeability of Free Space or Magnetic Constant - Electrical Engineering (EE) MCQ

The permeability of free space is also known as magnetic constant. The permittivity of free space is the electrostatic constant.

A diamagnetic material creates a magnetic field opposing that of the external magnetic field and it repels the external magnetic field. Hence its permeability is less than that of free space.

Magnetic susceptibility is the degree of magnetisation of a material in response to the external magnetic field. Diamagnetic substances repel the magnetic field and hence have negative susceptibility.

Magnetic susceptibility is the degree of magnetisation of a material in response to the external magnetic field. Paramagnetic substances weakly attract to the magnetic field and hence have positive susceptibility.

A paramagnetic material creates a magnetic field which is weakly attracted to that of the external magnetic field. Hence its permeability is more than that of free space.

Magnetic permeability is the constant of proportionality between the magnetic flux density and magnetic field strength of a given medium. Hence it has units henry/m.

Magnetic permeability is the constant of proportionality between the magnetic flux density and magnetic field strength of a given medium. Hence ∫0=B/H.

We know that:
∫0=B/H
Substituting the value of H from the question, we get B= 8*pi/10^-7T.

 We know that:
∫0=B/H
Substituting the value of B from the question, we get H = 10⁷A/m.

We know that:
∫0=B/H
Substituting the value of H from the question, we get B= 12*pi/10^-7T.