introduction to electromagnitic, Summaries of Electromagnetic Engineering

Download introduction to electromagnitic and more Summaries Electromagnetic Engineering in PDF only on Docsity!

• Lecture

Textbook:

“Engineering Electromagnetics”, William H. Hayt, Jr. and John A. Buck, McGraw-Hill, 2006. Textbook and Syllabus

Syllabus:

Chapter 1: Vector Analysis Chapter 2: Coulomb’s Law and Electric Field Intensity Chapter 3: Electric Flux Density, Gauss’ Law, and Divergence Chapter 4: Energy and Potential Chapter 5: Current and Conductors Chapter 6: Dielectrics and Capacitance Chapter 8: The Steady Magnetic Field Chapter 9: Magnetic Forces, Materials, and Inductance

Electric field Produced by the presence of electrically charged particles, and gives rise to the electric force. Magnetic field Produced by the motion of electric charges, or electric current, and gives rise to the magnetic force associated with magnets. What is Electromagnetics?

What is Electromagnetics?  (^) An electromagnetic field is generated when charged particles, such as electrons, are accelerated.  (^) All electrically charged particles are surrounded by electric fields.  (^) Charged particles in motion produce magnetic fields.  (^) When the velocity of a charged particle changes, an electromagnetic field is produced.

 (^) Electric and magnetic field exist nearly everywhere. Why do we learn Engineering Electromagnetics?

 (^) Electromagnetic principles find application in various disciplines such as microwaves, x-rays, antennas, electric machines, plasmas, etc. Applications

Applications Hard drive: Magnetic Data Storage  (^) A hard drive reads and writes data by using electromagnetism.  (^) The basic principle: (Write) If electric current (in form of digital signal) flows through a conductor, then a magnetic field is generated around the conductor. (Read) If a conductor pass through a magnetic field, then electric current (in form of digital signal) is generated.  (^) The disk constitutes the actual storage medium, consists of some form of substrate material (such as aluminium) on which a layer of magnetizable material has been deposited.  (^) As the field passes through the medium directly under the gap, it polarizes the magnetic particles so they are aligned with the field.

Transrapid Train

• (^) A magnetic traveling field moves the vehicle without contact.
• (^) The speed can be continuously regulated by varying the frequency of the alternating current. Applications