Electromagnetic Induction
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Key Stage 5
Meaning
Electromagnetic induction is the generation of an electromotive force (emf) in a conductor due to a change in magnetic flux.
About Electromagnetic Induction
- There are two physical laws governing electromagnetic induction.
- Faraday's Law states that the emf produced as a conductor experiences a changing magnetic field is proportional to the rate of change of that magnetic field with respect to time.
- Lenz's Law states that the direction of the induced emf is such that it opposes the change in flux that produced it (which is represented by a negative sign in the formula).
- Induced emf can be increased by increasing the rate of change of the magnetic flux, the number of turns in the coil, or the strength of the magnetic field|magnetic field.
- Electromagnetic Induction is a key principle in the operation of transformers, electric generators, and inductors.
Formulae
Electromagnetic Induction is described by Faraday's Law:
- \(\varepsilon=-\frac{\Delta\Phi}{\Deltat}\)
Where,
- \(\varepsilon\) is the electromotive force
- Φ is the magnetic flux
- t is the time.
Additionally Φ is given by:
- Φ=𝐵𝐴cos𝜃
Where:
- 𝐵 is the magnetic field strength
- 𝐴 is the area of the coil
- 𝜃 is the angle between the field and the normal of the area