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Magnetic Field of a Straight Current-Carrying Wire — result sheet
Calculate the magnetic-field magnitude around an ideal long straight wire carrying current.
Inputs used
Results
Visual chart
Breakdown
Calculation steps
Returned data table
Formula and methodology
Formula: B = mu0 I / (2 pi r) for an infinitely long straight wire.
The ideal straight-wire relation gives the circular magnetic-field magnitude at a radial distance. The right-hand rule supplies direction, which is not represented by this magnitude-only result.
This result follows the calculator's declared inputs, precision, validation boundaries, and model limits.
Input contract
- Current — A; minimum 0; maximum 1000000
- Radial distance — m; minimum 1.0E-6; maximum 1000000
Worked example
| Input | Value |
|---|---|
| Current | 10 |
| Radial distance | 0.1 |
Magnetic-field magnitude is 2.0e-5 T.
Assumptions and limits
- The wire is treated as infinitely long and straight.
- The surrounding medium is approximated as vacuum with the supplied SI permeability constant.
- Finite wire length, nearby magnetic materials, transients, and field direction are not modeled.
Calculator note
Source and methodology
Use the official WorldCalculate methodology policy for the source, formula, precision, and boundary standards behind this calculator.
Planning estimate, not financial, medical, legal, or professional advice. © WorldCalculate — reuse with attribution. Built and curated by Hassan ALRowaie.
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