- Electromagnetic induction occurs when a conductor moves within a magnetic field, inducing a current.
Methods of Electromagnetic Induction:
- Moving a conductor within a magnetic field.
- Moving a magnet within a stationary conductor.
Aim: To demonstrate electromagnetic induction.
- Set up a coil of copper wire with a galvanometer and a permanent magnet.
- Move the magnet towards the coil and observe the galvanometer’s needle movement.
Observation:
- The needle deflects momentarily when the magnet moves, indicating current induction. No current is induced when the magnet is stationary.
Illustration required
FARADAY’S LAW OF ELECTROMAGNETIC INDUCTION
- First Law: An electromotive force (EMF) is induced whenever there is a change in the magnetic flux linked with a coil.
- Second Law: The magnitude of the induced EMF is proportional to the rate of change of magnetic flux.
LENZ’S LAW
- States that the direction of the induced current is always such that it opposes the change in the magnetic field that produces it.
GENERATORS
- AC Generator: Uses a rotating coil in a magnetic field to produce alternating current.
DC Generator: Similar to AC but uses a commutator to produce direct current