PHY 272 (PHY 272 H)- Spring 2014

**Instructor: **Paulo
Bedaque, Physics Science Complex, room 3147

**Office hours:**
TuTh 12:30pm - 1:45pm

F 12:00pm - 12:50pm

** **

**Textbook: **Either **"**Electricity and
Magnetism", E.
Purcell, 2nd edition or **"**Electricity and
Magnetism", E. Purcell & D. Morin, 3rd edition. These books are
very similar but the third edition uses the SI unit system we will use
in lecture. Contrary to other topics, formulae in electromagnetism
actually change in different systems of units so it's convenient to
have the third edition. In any case I'll show you how to translate
formulae from one system to the other in class. The lectures will not
follow the book closely and the book (either edition) is only
recommended, not required. The level of mathematical sophistication
required in this class is somewhat above what most students start the
semester with. I'll help you with multivariable and vector calculus
during the semester and a good source for these topics is the free,
online textbook "Mathematical Tools for Physics", by J. Nearing, that
can be found here.
Chapters 8, 9 and 13 are the relevant ones.

**Discussion group:** Questions and comments should,
if at all possible, be made through Canvas. You can do it anonymously
if desired. This way your question, and my and your colleague's
answers, can help all other students. Canvas is not good at
mathematical equations so, depending on how things go, we may migrate
to Piazza.

**Grades:** The grade will be based on frequent
homeworks (10%), and three in-class exams (30% each).

**Syllabus and objectives: **The goal of this class
is to introduce the concept of electromagnetic fields and the
mathematics used in their description, understand the laws governing
them (Maxwell's equations) and apply these laws to a large variety of
situations arising in several branches of physics, astrophysics and
technology. The specific topics covered and the level of
sophistication will be comparable to Purcell's book but it's unlikely
we will be able to cover all chapters, in which case we will skip most
of electric oscillating current circuits (discussed in depth in
PHY272), dielectrics and magnetic materials.

Homework

homework_3 solution
correction

** Electrostatics**

Charge** **and electric field

Gauss' law; flux

Electric potential; line integral; gradients, divergence and curl; divergence and Stokes theorem

Conductors

**Magnetostatics**

Currents and Ohm's law; energy dissipation

Ampere's law

**Electromagnetic induction**

Faraday's law; inductance and self-inductance

Alternating current circuits

**Maxwell's equations**

Displacement current

Maxwell's equaiton in integral and differential form

Electromagnetic waves; energy transport

**Electric and magnetic fields in matter**

Electric dipoles, polarization and dielectrics

Magnetic dipoles, magnetization, ferromagnetics, paramagnetics and diamagnetics

**Relativity**

Origins of relativity and the relativistic invariance of
Maxwell's equations

**
**

**Useful links:**

Some people like " Div, Grad, Curl, and All That: An Informal Text on Vector Calculus", Fourth Edition, H. M. Schey.

Make sure you play with the applet
to find the field configurations generated by different charges
distributions. It is the best way to get some intuition for the
Coulomb law. There are other, better versions around the web. Let me
know if you find a particularly good one.

An amusing proof that
the line integral of a gradient over a closed contour must vanish (or,
what is the same, taht the curl of a gradient must vanish).

**Undergraduate Peer Tutoring**

There is a new tutoring service available to undergraduate physics
majors in the introductory courses, provided by physics majors who
have already completed the introductory series. The tutoring service
is available Monday through Friday, from 4pm - 6pm in PHYS 1204 (the
room next to the undergraduate student lounge). The tutors are happy
to provide homework help and discuss course topics in general with
students at no cost.

If you have any questions, please direct them to Hannalore
Gerling-Dunsmore at hannagd@terpmail.umd.edu
.

**Academic Integrity: ** The University of
Maryland, College Park has a nationally recognized Code

of Academic Integrity, administered by the Student Honor Council. This
Code sets standards for

academic integrity at Maryland for all undergraduate and graduate
students. As a student you

are responsible for upholding these standards for this course. It is
very important for you to be

aware of the consequences of cheating, fabrication, facilitation, and
plagiarism. For more information on the Code of Academic Integrity or
the Student Honor Council, please visit
http://www.studenthonorcouncil.umd.edu/whatis.html.