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. 4.1
Conductors
and Semiconductors

3. Material Media can be classified as
(1) Conductors
and Semiconductors
(2) Dielectrics
(3) Magnetic materials – magnetic property
Conductors and Semiconductors
Conductors are based upon the property of conduction, the phenomenon of drift of free electrons in the material with an average drift velocity proportional to the applied electric field.
electric property

4. In semiconductors, conduction occurs not only by electrons but also by holes – vacancies created by detachment of electrons due to breaking of covalent bonds with other atoms.
The conduction current density is given by
Ohm’s Law
at a point

5. conductors
semiconductors

6. Ohm’s Law s
Ohm’s Law

7. D4.1
(a) For cu,
(b)

8. (c) From

9. Conductor in a static electric field

10. rS = –e0E0
rS0
–rS0
E = – e0 az
rS = e0E0
rS = –e0E0
rS = e0E0
rS = –e0E0
rS = e0E0

11. P4.3
(a)
rS1
rS2

12. (b) Write two more equations and solve for the four unknowns. rS11