Public evidence

physics.em.coulomb

Machine-checked verification for calculation version 1.0.0 · tier expert_verified

Open calculator API Capability Download JSON CVP Manifest MCP Review policy

CVP: CVP VERIFIED · CVP protocol 1.0.0-proposed · Engineering assurance· Point charges in free space · Protocol · Schema · Production report

Declared partition coverage: PASS · 2/2 declared partitions (force, invalid-domain)
Versions: Calculation 1.0.0 · CVP protocol 1.0.0-proposed
CVP identity: 1/1 property · digest 232339ac4ad2

Verification

Legacy regression suite: 4/4 calculation tests · Production surface contract 4/4

Three distinct suites: educational examples on the calculator page, this legacy regression count (4/4 golden + boundary), and the CVP verification suite below. They are not the same number. Property, metamorphic, round-trip, O3, and interface statuses/checks are recorded in the CVP Manifest . SKIP (0/0) means that suite has no published vectors.

This calculator CURRENT · Public schema 1.0.0 matches · Semantic contract ✓ · Production attested · Public/cache ✓ · Origin ✓

CVP verification suite

Protocol checks from the Evidence Manifest. Distinct from the legacy regression suite above. Calculation version 1.0.0. CVP 1.0.0-proposed. 1/1 golden · 1/1 CVP boundary · 1/1 invalid · 1/1 property · 1/1 cross-interface · 1/1 CVP contract. digest 232339ac4ad2.

Golden (oracle-backed) 1 / 1
CVP boundary 1 / 1
Invalid input 1 / 1
Property 1 / 1
Cross-interface 1 / 1
CVP contract 1 / 1
Interfaces PASS · UI (SSR) / REST / MCP
Interface claim ui-ssr is query-result HTML, not a live browser session.
Assurance Engineering

release artifacts aligned PASS
schema valid input executes PASS
engine success output validates schema PASS
schema rejects incomplete input PASS

Fingerprint sha256:940b4d32151f2b8be94f29329124ef3a56c10cae4d6f77a89de0af73516ec7ff

Input schema sha256:9e4420a50311bbe512be5530c9a5aed56b4ea1ca5852417c5eab6a77d5ab8acc · Output schema sha256:213ae3cbd0052169df135a60be17f590909372421ca06d2601078403a347efea · Build-time SHA-256 digests prove published artifacts agree with each other (release_integrity.scope=workspace). Production attestation GETs canonical URLs twice (public/cached view and origin), including Capability HTML, via npm run attest:production --write (published at /.well-known/calculatorx-production-attestation.json) and fails if the public Capability page advertises a different calculation_version. This is artifact consistency, not an independent immutable release log.

Build & scope

Engine identity and declared limitations.

Tool: coulomb
Engine: coulomb
Engine build: 2026-09-10
Evidence core: 2026-09-10T03:39:44.474Z
Rendered: 2026-09-16T22:03:43.745Z
Last reviewed: 2026-08-08

Limitations

Point charges; εr=1

Sources

Standards and references supporting this tool specification. Methods are listed separately — they are algorithms, not bibliographic sources.

SI / electrostatics textbooks — Coulomb's law
Supports: F=k|q1q2|/r²
CODATA / NIST — Coulomb constant — k = 1/(4πε₀)
Supports: Pinned k = 8.9875517923×10⁹

Legacy published checks

Golden and boundary cases from the legacy Evidence JSON. CVP property, metamorphic, round-trip, O3, and interface statuses/checks are recorded in the Manifest — including SKIP when a suite has no vectors.

ID	Kind	Status	Detail
`force`	golden	pass	Expected F_N=0.8987551792299998 · Actual mode=force · q1_C=0.000001 · q2_C=0.000001 · r_m=0.1 · k=8987551792.3 · F_N=0.8987551792299998 · attractive=false
`attract`	golden	pass	Expected attractive=true · Actual mode=force · q1_C=0.000001 · q2_C=-0.000001 · r_m=0.1 · k=8987551792.3 · F_N=0.8987551792299998 · attractive=true
`bad-r`	boundary	pass	Expected VALUE_MUST_BE_POSITIVE · Actual VALUE_MUST_BE_POSITIVE
`property-F`	property	pass	F