Magnetic Reluctance: Ohm's Law for Magnets

Magnetic flux takes the easy path, and iron is a thousand times easier than air. Reluctance is the magnetic version of resistance, and a tiny air gap in an iron core can dominate the whole circuit. This video builds a magnetic circuit and shows the flux choosing its route.

It also shows why relays pull in with a snap, and how the air gap sets an inductor's behaviour.

In this video

• Reluctance as magnetic resistance
• Why a small air gap dominates
• The magnetic circuit analogy
• Relays, solenoids and gapped inductors