What charge is

The electron doesn’t have an electric field, it has an electromagnetic field. If you’re a positron and I set you down near a motionless electron, you will move linearly towards it, and it will move linearly towards you. So you might think the electron has a radial electric field, which results in a linear electric force. But it doesn’t. That linear force is there because the electron has an electromagnetic field, and so do you. Linear and rotational force Moreover the interaction between these fields doesn’t…

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Why magnetic monopoles do not exist

There’s a lot of articles about magnetic monopoles. See this for example: the hunt for magnetism’s elementary particle begins. It dates from 2016, and it’s by Avaneesh Pandey. He says this: “magnets, for reasons we still do not understand, seem to exist only in the form of dipoles - ones with a north and a south end. Break a bar of magnet into two, and you still do not get a magnetic monopole. Instead, you now have two smaller magnets, each with its north and south…

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How a magnet works

There's a rather interesting Discover magazine article called Three Words That Could Overthrow Physics: “What Is Magnetism?”. It was written by Bruno Maddox in 2008. The subtitle is "The standard model still doesn't describe magnets' spooky action at a distance". Maddox was on holiday reading Electronics for Dummies when he realised that he didn't how a magnet works. He said this: "I set out on what I assumed would be a minutes-long odyssey to understand the phenomenon. Seventy-one days later, I am here with astonishing findings.…

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The screw nature of electromagnetism

If you’ve ever read Maxwell’s On Physical Lines of Force, you may have noticed this: “a motion of translation along an axis cannot produce a rotation about that axis unless it meets with some special mechanism, like that of a screw”. Maxwell was referring to what I can only describe as the screw nature of electromagnetism. If you have a pump-action screwdriver you’ll appreciate that linear force is converted into rotational force. That’s like an electric motor: current flows through the wire, and the motor turns.…

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