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

The core of any transformer is laminated so as to

The plane of eddy currents makes an angle with the plane of magnetic lines of force equal to $...^o$.

Assertion: $A$ laminated core is used in transformers to increase eddy currents.
Reason: The efficiency of a transformer increases with increase in eddy currents.

What is electromagnetic damping?

The core of a transformer is laminated to reduce energy losses due to: