1. Edward C. Jordan Memorial Offering of the First Course under the Indo-US Inter-University Collaborative Initiative in Higher Education and Research: Electromagnetics for Electrical and Computer Engineering by
Nannapaneni Narayana Rao
Edward C. Jordan Professor of Electrical and Computer Engineering
University of Illinois at Urbana-Champaign
Urbana, Illinois, USA
Amrita Viswa Vidya Peetham, Coimbatore
July 10 – August 11, 2006

2. 4.3 Magnetic Materials

3. Magnetic Materials Diamagnetism:
are based upon the property of magnetization, which is the
phenomenon of creation of magnetic dipoles within the
material.
Diamagnetism:
A net dipole moment is induced by changing the angular
velocities of the electronic orbits.
Dipole moment
m = IA an

4. Paramagnetism
Already existing dipoles are acted upon by a torque.

5. The phenomenon of magnetization results in a magnetization
current in the material which produces a secondary B.

6. Magnetization Current

7. To take into account the effect of magnetization, we define the
magnetic field intensity vector, H, as
mr and m vary with the material, implicitly taking into account
the effect of magnetization.

8. As an example, consider
Then inside the material,

9. D4.6
For 0 < z < d,
(a)

10. (b)
(c)