Definition

1. Noun (Physics):
   • A vector quantity describing the force that a magnetic field exerts on a moving electric charge: It is a measure of the intensity of a magnetic field at a specific point, independent of the magnetic properties of the surrounding material.
   • The magnitude of the magnetic field vector H: In technical contexts, it specifically refers to the magnetic field strength H, as opposed to the magnetic flux density B.

Usage and Examples

• Noun:
  • The magnetic field strength inside the solenoid was calculated to be 500 amperes per meter.
  • Scientists measured the magnetic field strength generated by the experimental coil.
  • A higher magnetic field strength is required to align the magnetic domains in the material.

Advanced Usage and Technical Notes

• Distinction from Magnetic Flux Density (B): In electromagnetism, magnetic field strength (H) and magnetic flux density (B) are related but distinct concepts. H is measured in amperes per meter (A/m) and describes the field from free currents. B, measured in teslas (T), includes the magnetization of the material and is often what is sensed as "magnetic force."
• In Materials: Inside a material, the relationship is B = μ₀(H + M), where μ₀ is the permeability of free space and M is the magnetization of the material.
• "Strength of the magnetic field": A common descriptive phrase equivalent to "magnetic field strength."
  • The strength of the magnetic field diminishes with distance from the magnet.

Variants and Related Words

• Magnetic field intensity: A direct synonym for magnetic field strength.
• Magnetizing field: Another term used, emphasizing its role in magnetizing materials.
• H-field: The standard symbol and shorthand used in physics and engineering equations.
• Magnetic flux density (B): The related quantity representing the total magnetic field, including the material's response.

Synonyms

• Magnetic field intensity
• Magnetizing force
• H-field

Common Phrases and Contexts

• "To measure magnetic field strength": A standard phrase in experimental physics and engineering.
  • They used a Hall effect sensor to measure the magnetic field strength.
• "Uniform magnetic field strength": Describes a field where H is constant in magnitude and direction.
  • The experiment requires a region of uniform magnetic field strength.

Noun

1. the amount of magnetic flux in a unit area perpendicular to the direction of magnetic flow