Wednesday, May 11, 2022

New Electromagnetism Lessons Added

Right hand rules in high school physics do not bring me great joy. I cringed when The Physics Teacher ran a photoessay from an instructor who photographed students contorting hands during an exam. (A cursory search for this article was unsuccessful. I hope it was expunged.) 

Nevertheless, 3-D geometry cannot be avoided when studying magnetic fields and forces. In the ├śrsted's discovery lab, students develop a right hand rule relating to current and the magnetic field it produces. That was Right Hand Rule #1.

This activity relates current, external magnetic field, and magnetic force. Right Hand Rule #2.

Just an exercise in exercising the right hand rule of your preference. After a few simple scenarios, things get a bit more interesting and the last one is quite open-ended.

We move from the Lorentz force to a derivation of V = BLv step by step. Tangential, peripheral references to an ancient Monty Python sketch can be found, but need not be appreciated.

Sometimes textbooks jump into flux a bit hastily. So I produced this lesson to build the concept by analogy to wind blowing through a window. "Air flux" is more intuitive, and offers a path toward understanding magnetic flux.

Once flux is on board, developing Faraday's Law of Electromagnetic Induction can be attempted. The derivation is taken one step at a time, but we eventually get there. The core of Faraday's law is that the voltage induced in a loop is the rate at which flux changes. The "–" and the "N" in the equation serve a purpose, but are not central to the application of Faraday's law.

All of these have been added to A Bundle of Phyz: ELECTROMAGNETISM.

Saturday, May 7, 2022

Picture a Scientist

I thought this needed a question set, so I wrote one. It's now the featured free resource at The Lessons of Phyz store on Teachers Pay Teachers.

Thursday, May 5, 2022

The Secrets of Quantum Physics

Professor of physics Jim Al-Khalili investigates the most accurate and yet perplexing scientific theory ever - quantum physics. The program's two episodes
stream on Amazon Prime. YouTube links have also been embedded in the text below and the titles in the student documents.

The history of and battle over quantum entanglement. Albert Einstein hated the idea that nature, at its most fundamental level, is governed by chance. Professor Jim Al-Khalili reveals how, in the 1930s, Einstein thought he'd found a fatal flaw in quantum physics because it implies that subatomic particles can communicate faster than light in defiance of the theory of relativity. Delightful bonus: "Tangled Up With You" by Eliza's Uncertainty, a perfect addition to your modern physics playlist.