GCSE Physics Question Analysis Topic: Physics - Magnetic Field
(a) How are eddy currents generated in a conductor subjected to magnetic field n?
(b) Write two examples of their useful applications.
(c) How can the disadvantages of eddy currents be minimized?
(a) When a conductor is exposed to a magnetic flux that changes over time, the conductor forms a few tiny loops as a result of the changing magnetic field, and current flows through these loops in accordance with Faraday's law.
Eddy currents are the name for these currents.
(b) The use of eddy currents
Eddy current brakes employ the drag force produced by eddy currents to slow down or stop moving objects by electromagnetic means. For instance, railroad vehicles have electromagnetic brakes.
Separation of aluminum cans from other metals using levitation. Aluminum is pushed away from the magnet in an eddy current separator while ferrous metals stick to the magnet.
(c) Making thin strips in place of a block for the induction core can lessen the drawbacks of eddy current.
End of analysis. Great!