Magnetic flux definition
- Electromagnetic induction is the process of inducing an e.m.f in a conductor when there is relative movement between a charge and a magnetic field
- This can be observed using a magnet and a coil or a solenoid
- This happens when a conductor cuts through magnetic field lines
- The amount of e.m.f induced is determined by the magnetic flux
- The amount of magnetic flux varies as the coil rotates within the field
- The flux is the total magnetic field that passes through a given area
- It is a maximum when the magnetic field lines are perpendicular to the plane of the area
- It is 0 when the magnetic field lines are parallel to the plane of the area
- The magnetic flux is defined as:
The product of the magnetic flux density and the cross-sectional area perpendicular to the direction of the magnetic flux density
- In other words, magnetic flux is a measure of the number of magnetic field lines passing through a given area
Maximum and minimum magnetic flux
The magnetic flux is maximum when the magnetic field lines and the area they are travelling through are perpendicular