2.6 - Magnetic fields and electromagnetic induction

Magnetic flux density

force per unit length per unit current on a current-carrying conductor at right-angles to a magnetic field

Fleming’s left hand rule

allows you to determine the direction of motion, field and current in relation to one another

Lenz’s law

the direction of induced current is always such that it is opposed to the change that causes the current

Faraday’s law

the induced emf in a circuit is equal to the rate of change of magnetic flux linkage through the circuit

induced emf

the p.d. induced in a wire due to a moving changing magnetic flux

Cylcotrons

accelerate radioactive particles and control the direction of the particle beams in order to accurately hit the target area on a patient - used in medical machinery to provide radiotherapy treatment

magnetic flux

magnetic field strength through an area

magnetic flux linkage

magnetic field strength through a coil of wire - the flux is multiplied by the number of turns in the coil