What's il difference tra H e B fields?

H (A/m) e il applied magnetic field strength—what you create con currents o magnets. B (tesla) e il resulting flux density including il material's response. In materials con high permeability like iron, B puo be thousands di times larger than μ₀H sarebbe predict.

Perche do magnet specs usare oersteds?

Oersted e un convenient scale per permanent magnet characterization. Coercivity (resistance un demagnetization) typically ranges da hundreds un thousands di oersteds—nice round numbers. Il CGS system e also traditional in magnetism research.

How do I calcolare H in un solenoid?

For un long solenoid: H = nI, dove n e turns per metro e I e current in ampere. H e in A/m. Il resulting B = μ₀μᵣnI depends on what's inside il solenoid (air: μᵣ = 1, iron core: μᵣ ~ 1000-5000).

Intensità del campo magnetico Converter

Informazioni Magnetic Field Strength Conversione

Magnetic field strength (H-field) measures il magnetizing force that creates magnetic flux in un material. It's distinct da magnetic flux density (B-field)—H represents il applied field da currents e external sources, while B includes il material's magnetic response. This distinction e crucial: il same H-field produces vastly different B-fields in air versus iron due un iron's high permeability. H e il independent variable you control; B e il resulting field including il material's contribution.

Il SI unit e ampere per metro (A/m), representing magnetomotive force per unit length. Il older CGS unit oersted (Oe) e still widely used per permanent magnet specifications, coercivity ratings, e magnetic recording media. Il B-H curve (hysteresis loop) that characterizes magnetic materials plots B versus H. Comprendere H e essential per magnetic circuit design, material characterization e selection, electromagnet coil design, e demagnetization analysis.

Our converter handles all standard magnetic field strength units used in electromagnetic engineering.

Comuni Magnetic Field Strength Conversions

Da	A	Moltiplica Per
A/m	Oe (oersted)	0.01257 (4π/1000)
Oe	A/m	79.577 (1000/4π)
A/m	kA/m	0.001
kA/m	A/m	1,000
A/m	Gb/cm	0.01257
A/m	A/cm	0.01
Oe	Gb/cm	1 (equivalent)
A/cm	A/m	100
A/m	A/cm	0.01

Magnetic Field Strength Unita Riferimento

Ampere per metro (A/m) – Il SI unit di magnetic field strength, representing magnetomotive force per unit length o equivalently current per unit length in un ideal solenoid. Inside un long solenoid: H = nI, dove n e turns per metro. Il relationship un B-field in vacuum e B = μ₀H, dove μ₀ = 4π × 10⁻⁷ H/m. In materials, B = μ₀μᵣH con relative permeability μᵣ ranging da ~1 (air) un 100,000+ (specialized alloys).

Oersted (Oe) – Il CGS unit di magnetic field strength, named after Hans Christian Ørsted who discovered electromagnetism in 1820. 1 Oe = 1000/(4π) A/m ≈ 79.577 A/m. Il oersted remains dominant in permanent magnet specifications: ferrite magnets hanno coercivity ~2000-4000 Oe; alnico ~600-2000 Oe; rare-earth (NdFeB) ~10,000-25,000 Oe. Magnetic recording media also usare oersteds per coercivity.

Kiloampere per metro (kA/m) – 1000 A/m, il practical SI unit per magnetic material data sheets e strong fields. Saturation magnetization di iron e circa 1700 kA/m. Coercivity di NdFeB magnets e 800-2000 kA/m. This unit avoids il SI-CGS confusion that plagues il oersted.

Gilbert per centimetro (Gb/cm) – CGS unit esattamente equal un il oersted da definition. 1 Gb/cm = 1 Oe ≈ 79.58 A/m. This notation makes il relationship un magnetomotive force (gilberts) explicit.

Ampere per centimetro (A/cm) – 100 A/m, occasionally used as un compromise tra A/m e il CGS system. Convenient per some laboratory misurazioni dove centimetro scales sono natural.