Eddy currents are produced when

The shiny metal disk in the electric power meter (analog type) rotates due to

Consider a metallic pipe with an inner radius of $1 \ cm$. If a cylindrical bar magnet of radius $0.8 \ cm$ is dropped through the pipe,it takes more time to come down than it takes for a similar unmagnetised cylindrical iron bar dropped through the metallic pipe. Explain.

The working of magnetic braking of trains is based on

The core used in transformers and other electromagnetic devices is laminated to

$A$ metal sheet is placed in a magnetic field that changes from zero to maximum. If the figure shows the direction of eddy currents,then the direction of the magnetic field is: