A teaching tape for SR-12, charge and current density
charge and current transformation
Teaching tape demonstrating the transformation of charge and current density under a 0.6c boost.
Open SR-12 with these settings
Where it starts
| Setting | Value |
|---|---|
| Observer boost speed (boost) | 179875474.8 |
| Charge density (stationary frame) (chargeDensity) | 0 |
| Current density Jx (currentDensityX) | 1 |
What it changes, and what to expect
Set Observer boost speed (boost) to 179875474.8 describes the same world from somewhere else
A wire that carries current and is neutral at rest, seen from 0.6c
At 0.6c a neutral wire with Jx=1 A/m² develops a net charge density rho'=-2.5017e-9 C/m³ while current transforms to J'x=1.25 A/m².
These are the values the tape's author recorded, not a result this page computed. Nothing here runs the instrument. Open SR-12 with these settings: the link opens it with them already in place. Compare what it gives you with what is recorded here. The settings travel in the link and the laboratory reads them as it loads, so without JavaScript it opens at its worked example instead.
What these numbers were recorded under
| Identity | Recorded as |
|---|---|
| Model | charge-current-host version 1 |
| Seed | 0 |
| Random-stream semantics | version 1 |