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. Ampére’s Circuital Law
2.4
Ampére’s Circuital Law

3. Ampére’s Circuital Law

4. = Magnetomotive force (only by analogy with electromotive force),
= Current due to flow of charges crossing S,
= Displacement flux, or electric flux, crossing S,

5. = Time rate of increase of displacement flux crossing S, or, displacement current crossing S,
Right-hand screw rule.
Any surface S bounded by C, but the same surface for both terms on the right side.

6. Three cases fo clarify Ampére’s circuital law
(a) Infinitely long, current carrying wire
No displacement flux

7. (b) Capacitor circuit (neglect fringing of field in the capacitor)

8. (c) Finitely long wire

9. Uniqueness of

10. Displacement current emanating from a closed surface = – (current due to flow of charges emanating from the same closed surface)

11. D2.9 (a) Current flowing from Q2 to Q3.

12. (b) Displacement current emanating from the
spherical surface of radius 0.1 m and centered at Q1.
(c) Displacement current emanating from the spherical
surface of radius 0.1 m and centered at Q3.

13. Interdependence of Time-Varying Electric and Magnetic Fields

14. Hertzian Dipole