The Maxwell stress tensor may be used to calculate electric and magnetic forces on objects. The method is seldom introduced in introductory texts on electromagnetism. Advanced texts often present the Maxwell stress tensor as a mathematical abstraction without explaining why is is useful. In reality, the method is critical for practical force calculations in numerical codes. [...]
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With computers of increasing speed and power, it’s tempting to use numerical methods for everything. Because I’m old school (or maybe just old), I always enjoy a calculation where a few minutes of thought can circumvent hours wasted on the computer. I was recently asked by a manufacturer to prepare a demonstration showing how to use Magnum [...] Backup and synchronization are inevitable problems when you work on more than one computer. There are two issues: 1) backing up work you have just performed and 2) transferring files to another computer without accidentally over-writing newer versions. The problem is of particular concern for me as a software developer working in a variety of locations. [...] This week, we released a new textbook on our site, Finite-element Methods for Electromagnetics. It joins the books Principles of Charged-particle Acceleration and Charged-particle Beams in our collection of free resources for scientists and engineers. My interest in electronic texts started in 1999. I got a notice from Wiley-Interscience that Principles of Charged-particle Acceleration (published in 1986) [...] By nature, I’m not a person who jumps into new things. A decade ago, I was telling my son that E mail was a pretentious novelty that would soon disappear. Nonetheless, I’ve been talked into trying new things that have proved to be useful and fun, such as this blog. A year ago, I recorded a [...] |
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