Gilbert

Definition

The gilbert (Gb) is a unit of magnetomotive force used in the centimeter-gram-second (CGS) system of units. It quantifies the amount of magnetic influence that produces a certain magnetic field strength.

5 Must Know Facts For Your Next Test

1. The gilbert is named after William Gilbert, an early researcher in magnetism.
2. 1 gilbert is equivalent to $10/(4 \pi)$ ampere-turns in the International System of Units (SI).
3. Magnetomotive force (MMF) in gilberts can be calculated using the formula: $MMF = H \times l$, where $H$ is the magnetic field strength and $l$ is the length of the path through which the magnetic field circulates.
4. While not as commonly used today, understanding gilberts can help provide historical context for modern units like the ampere-turn.
5. In practical applications, magnetomotive force drives magnetic flux through a magnetic circuit.

Review Questions

• What does one gilbert quantify in terms of magnetism?
• How many ampere-turns are equivalent to one gilbert?
• Explain how to calculate magnetomotive force using gilberts.

Related terms

Magnetomotive Force (MMF): The driving force that establishes a magnetic field in a magnetic circuit, measured in either ampere-turns or gilberts.

Ampere-Turn: A unit of magnetomotive force used in the SI system, defined as the product of current (in amperes) and number of turns in a coil.

Magnetic Field Strength ($H$): $H$ represents the intensity of a magnetic field produced by an electric current or magnet, usually measured in amperes per meter (A/m) in SI units.