I am a graduate student in applied mathematics and I am looking for a concise introduction to Maxwell's equations / basic principles of electromagnetism. (I have enjoyed the book by Purcell, Electricity and Magnetism, as an undergrad but I have forgotten most of it). I would like something that covers the conceptual details in a quick way and not necessarily a big textbook.
Thank you.
I recommend this book. You can easily find an e-version online. If you are interested you can try Jackson's book.
A quick googling should lead you to OCW website, t'hooft's website, etc. And you can find more extensive booklists.