BRAINCAKEMagnetic Flux density
The strength of a magnetic field is also known as the magnetic flux density and is given the symbol B. The magnetic field strength B is the force per unit current length on a wire carrying current I in the magnetic field when the current is at right angles to the magnetic field and in measured in tesla (T). If the field and current are not at right angles to each other, then the component of the field perpendicular to the current is equal to BsinΘ where Θ is the angle between the wire and the magnetic field. The force F on the wire can be measured using a current-balance where F = BIL.
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Key terms in this lesson
- Magnetic flux
- The product of the magnetic flux density and the area through which the field passes at right angles to it, measured in weber.
More in Magnetic Fields
- Magnetic Field
- Force on a current-carrying wire
- Couple on a coil in a magnetic field
- An Electric Motor
- Force on a moving Charge in a Magnetic Field
- Cyclotron
- The Mass Spectrometer
All 8 lessons in Magnetic Fields · All AQA A-level Physics topics