Magnetic Field Calculator
Calculate the magnetic field strength around a straight current-carrying wire using the Biot-Savart law (simplified).
Magnetic Field Strength
Magnetic Field around a long straight wire carrying current is calculated from the Biot-Savart law (simplified):
B = (μ₀ × I) / (2π × r)
Where:
- B = magnetic field strength (Tesla)
- μ₀ = permeability of free space (4π × 10⁻⁷ T·m/A)
- I = current in Amps
- r = perpendicular distance from wire (meters)
Field strength units:
- 1 Tesla (T) = 10,000 Gauss (G)
- 1 mT = 10 G
Reference values:
| Source | Field Strength |
|---|---|
| Earth’s field | ~25–65 μT |
| Fridge magnet | ~5 mT |
| MRI machine | 1.5–3 T |
| Neodymium magnet | ~1.4 T |