# PHYS 436 :: Physics Illinois :: University of Illinois at Urbana-Champaign

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### Announcements

Welcome to Physics 436!

We will meet on Monday August 27 at 9 am in LLP 144. I'm looking forward to meeting all of you there. It is very important for you to come to all of the lectures since this is a fast paced and difficult course.

Here's what we're going to do:

We will begin with some lectures reviewing electrostatics and magnetostatics and quickly get on to EM radiation. We will consider how light propagates in vacuum and dielectrics. We will cover reflection and refraction from dielectric interfaces which requires us to match boundary conditions for D, E, B and H. We will also describe how light reflects from conducting surfaces. Following this we will explore the energy, momentum and angular momentum contained in EM radiation. Up to this point we will have worked directly with the electric and magnetic fields themselves. To study radiation and other physics, we will develop a potential formalism with a more complicfated relationship between the sources, fields, and the scalar and vector potentials than we saw in time independent problems. In particular, the gauge choice that simplifies the equations for the potential functions is known as the Lorentz gauge. The resulting theory provides a convenient way to describe all types of radiation processes in which light is generated.. Following this, we will study how light propagates inside conducting tubes (waveguides) and also study the resonant behavior of EM cavities. We will wrap up the course with a complete description of special relativity which we will see is made necessary by the results developed so far. This will include a completely relativisitic description of Maxwell's Equations in terms of 4-vectors and 4-tensors.

Discussion sections begin on Tuesday August 28. Please attend the section you signed up for.

Homework will be assigned on Mondays and your solutions are due a week later by 5 pm in the 436 HW box.

We are trying to get office hours scheduled for Thursday afternoons, probably 1-5 pm. As of now (8/24) that's still up in the air.

### Regarding Homework

Homework is to be turned into the 436 homework box on the second floor of Loomis by the time and date listed on the assignment. Homeworks will not be accepted via email. Homework turned in late will recieve a reduced score according to the following formula: The maximum score is reduced to 90% if the homework is up to one day late, and this is reduced by 10% for each day beyond that. If you hand your homework in late it is your responsibility to get it delivered in person to one of the course graders. I am going to try to get the homework assignments returned to you at the time of Friday's lecture, and there will be zero credit afterwards. If you have an official excuse (McKinley) up to 2 assignments can be excused. Please submit your excuse documentation within XX business days via the Excused Absences application.

### Academic Integrity

All activities in this course, including documentation submitted for petition for an excused absence, are subject to the Academic Integrity rules as described in Article 1, Part 4, Academic Integrity, of the Student Code.