The cores used in transformers are laminated to

Eddy currents are produced when

What are eddy currents? Who discovered eddy currents?

$A$ metallic ring connected to a rod oscillates freely like a pendulum. If now a magnetic field is applied in a horizontal direction so that the pendulum now swings through the field,the pendulum will

$A$ light disc made of aluminium (a nonmagnetic material) is kept horizontally and is free to rotate about its axis as shown in the figure. $A$ strong magnet is held vertically at a point above the disc away from its axis. On revolving the magnet about the axis of the disc,the disc will (figure is schematic and not drawn to scale)-

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