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

The use of eddy currents is done in the following,except:

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.

Discuss the uses of eddy current.

The core of any transformer is laminated so as to

$A$ magnet is dropped down an infinitely long vertical copper tube.