E-CodeCoulomb's law: force, field, three charges — a TI-84 Plus CE program
COULOMB is a TI-BASIC program for the TI-84 Plus CE. Force between two point charges (attract or repel), the field and potential of a point charge at a distance, or the net force on a third charge from two others on a line (positive = toward +x). k = 8.9875517923ᴇ9 N·m²/C², charges in coulombs.
What it asks for and what it shows
It asks for 3 values at its prompts, after you pick option 1 from its menu. In the example below it shows F (N), ATTRACT.
Example run
One of its oracle test cases: “opposite charges attract”. The inputs are typed in order, and the results are the values the case expects on the screen.
| Step | Value |
|---|---|
| You enter | |
| Menu | option 1 |
| Input 1 | 3ᴇ⁻6 |
| Input 2 | ⁻5ᴇ⁻6 |
| Input 3 | 0.2 |
| The screen shows | |
F (N)= | 3.370331922 |
| Text | ATTRACT |
How it's checked
7 test cases, each checked against an independent method. Replayed key by key on a virtual TI-84 Plus CE, they make 27 checks.
How E-Code checks every program
Run it or put it on your calculator
- Open the library in the TI-84 Plus CE calculator and pick “Coulomb's law: force, field, three charges” (COULOMB).
- Put it on your own calculator with a computer and a USB cable, or type it in by hand.
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All TI-84 Plus CE physics programs · All TI-84 Plus CE programs