How Special Relativity Explains Magnetism

Veritasium · Explainer · 4 min · 2013 · YouTube title: How Special Relativity Makes Magnets Work

Why it's here

HN commenters recommend it as a short, clear explanation of why moving charges create magnetic fields.

What it covers

Veritasium explains magnetism as a consequence of special relativity. Length contraction of moving charges makes a current in a wire attract or repel a nearby moving charge.