Books etc

Electron's spin - Part 2

In the article Electron's spin - Part 1, we talked about how scientists first thought that electrons might be like tiny spinning balls and that they intrinsic “up” or “down” property was a sort of angular momentum. But this idea didn’t last long because: electrons don’t spin like regular obje...…
in quantum concepts
Electron's spin - Part 2

Are there East-West magnets instead of North-South?

In the Magnetic poles' article we learnt that magnets have two special ends called poles, and we call them the North pole and the South pole. These names come from how magnets behave when you let them move freely, like in a compass. A long time ago, people discovered that one end of a fr...…
in questions
Are there East-West magnets instead of North-South?

Does a magnet work under water?

Water does not block or weaken a magnetic field, so the magnet will attract objects as usual underwater. That's why Magnet fishing is possible. Materials like wood, plastic, glass, and rubber let the magnetic field pass through them without weakening it. All these materials do not interact mu...…
in questions
Does a magnet work under water?

Why some materials don't stick to a magnet?

Some materials don't stick to a magnet because they aren't magnetic. The article Magnetic materials explains the difference between magnetic and non-magnetic materials. Most magnetic materials contain iron, nickel, or cobalt. In these materials, some electrons have their spins naturally alig...…
in questions
Why some materials don't stick to a magnet?

Why magnets can push and pull something without touching it?

Magnets can push and pull things without touching them because they are surrounded by an invisible magnetic field. In Book 2 the electrons explain to Millie how it works. The article about Magnetism shows us that the magnetic field spreads out around the magnet. It can be visualized with i...…
in questions
Why magnets can push and pull something without touching it?

Book 1 outline

Macroscopic concepts Millie micro nano pico Measurement scales and vectors Waves Diffraction Angular momentum Quantum concepts Empty space in atoms Electron's spin Wave function Wave-particle duality Heisenberg's uncertainty principle History Elementary par...…
in outlines
Book 1 outline

The legend of the boy who found the first magnet

A long time ago in ancient Greece, there was a shepherd boy named Magnes. He spent his days taking care of his sheep in a place called Magnesia. One day, while walking around with his iron staff to help him guide the sheep, he noticed something strange. His staff was sticking to the ground! C...…
in history
The legend of the boy who found the first magnet

Compass

A compass is a tiny magnet that can spin around! It’s usually inside a round case with directions North, South, East, and West) marked on it. The compass needle always tries to point toward the Earth’s magnetic South Pole, so you can use it to find your way around. If you put a magnet close to a...…
in macroscopic concepts
Compass