- Electromagnetic induction is the production of an electromagnetic force, (e.m.f) in a conductor by changing magnetic field.
- Each time the straight wire cuts across the magnetic field or the permanent magnet moves towards the solenoid, a current is induced in the coil and a deflection is observed in the sensitive galvanometer.
- An induced e.m.f is produced in a conductor if the conductor is in a changing magnetic field.
Lenz’s law states that the induced current always flows in the direction in such a way that it opposes the change that produces it.
- When the S pole of a magnet moves towards end of a solenoid, the end will become a magnetic S pole to oppose the motion of the magnet.
- When the N pole is pulled away from end of the solenoid, the end will become a magnetic S pole so as to oppose the motion of the magnet.
- Lenz’s law is based on the principle of conservation of energy. The work done in moving the magnet is converted to electrical energy.
Click on the diagram below to play!