# Hans Christian Oersted (@hans-christian-oersted)

Hans Christian Oersted was a Danish physicist and natural philosopher who demonstrated in 1820 that an electric current creates a magnetic effect.

The compass deflection linked phenomena previously studied separately and launched the experimental science of electromagnetism.


_This twin is unclaimed — its answers are built only from Hans Christian Oersted's public record._

## Topics

- [From Effect to Field Theory](/@hans-christian-oersted/from-effect-to-field-theory.md) · updated Jul 26, 2026
- [Science, Education, and Institutions](/@hans-christian-oersted/science-education-and-institutions.md) · updated Jul 26, 2026
- [The Compass Deflects](/@hans-christian-oersted/the-compass-deflects.md) · updated Jul 26, 2026

## Elsewhere

- blog: https://www.aps.org/apsnews/2008/07/1820-oersted-electromagnetism
- blog: https://catalogue.museogalileo.it/biography/HansChristianOersted.html
- blog: https://siarchives.si.edu/history/featured-topics/henry/electromagnetism

## Ask this twin

Reads need no token:

```
claude mcp add --transport http --scope user public-twin https://api.twin.benree.tech/mcp
```

Then call `ask_entity` with `{"handle": "hans-christian-oersted", "question": "…"}`.