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Radiating Charge
The electric field lines from a point charge evolve in time as the charge moves. Watch radiation propagate outward at the speed of light as you wiggle the charge. Stop a moving charge to see bremsstrahlung (braking) radiation. Explore the radiation patterns as the charge moves with sinusoidal, circular, or linear motion. You can move the charge any way you like, as long as you don’t exceed the speed of light.
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Teaching Resources
Main Topics
- Electromagnetic Radiation
- Dipole Radiation
- Electric Field
- Speed of Light
Sample Learning Goals
- How the radial field line density depends on the speed of a charge in linear motion (compression of field lines).
- How the anisotropy of the field pattern depends on sinusoidal vs. circular motion.
- How the applied force and motion are related in relativistic dynamics (constant force does not result in faster-than-light travel).
- How acceleration produces transverse fields, while constant velocity produces radial fields.
- For sinusoidal motion, which produces dipole radiation, the field lines evolve from radial and static-like nearby, to transverse and plane-wave-like far away.
- How sudden deceleration of a charge produces bremsstrahlung (braking) radiation.
Teaching Ideas
You can submit your own ideas and activities.
Related Simulations
Translated Versions:
| Language | Language (Translated) | Simulation Title | ||
|---|---|---|---|---|
| Basque | Basque | Karga-Erradiatzailea | Run Now | Download |
| Chinese - Simplified | 中文 (中国) | 电荷辐射 | Run Now | Download |
| Chinese - Traditional | 中文 (台灣) | 電荷輻射 | Run Now | Download |
| Danish | Dansk | Udstrålende ladning | Run Now | Download |
| Dutch | Nederlands | Radiating Charge | Run Now | Download |
| Finnish | suomi | Säteilevä varaus | Run Now | Download |
| Greek | Ελληνικά | Φορτίο ακτινοβολίας | Run Now | Download |
| Hebrew | עברית | מטען קורן | Run Now | Download |
| Hungarian | magyar | Sugárzó töltés | Run Now | Download |
| Italian | italiano | Carica radiante | Run Now | Download |
| Korean | 한국어 | 방사 충전 | Run Now | Download |
| Macedonian | македонски | Зрачење на електрицитети во движење | Run Now | Download |
| Persian | Persian | بار در حال تابش | Run Now | Download |
| Polish | polski | Promieniujący ładunek | Run Now | Download |
| Serbian | Српски | Зрачење наелектрисања у кретању | Run Now | Download |
| Spanish | español | Carga Radiante | Run Now | Download |
| Spanish (Peru) | español (Perú) | Carga Radiante | Run Now | Download |
| Vietnamese | Tiếng Việt | Điện tích bức xạ | Run Now | Download |
Software Requirements
| Windows | Macintosh | Linux |
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Microsoft Windows
XP/Vista/7 Macromedia Flash 9 or later |
OS 10.5 or later
Macromedia Flash 9 or later |
Macromedia Flash 9 or later |
Credits
| Design Team | Third-party Libraries | Thanks To |
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