$A$ metal detector works on the principle of:

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

In which of the following devices,the eddy current effect is not used?

$A$ spherical insulating ball and a spherical metallic ball of the same size and mass are dropped from the same height. Choose the correct statement out of the following (Assume negligible air friction).

Discuss the uses of eddy current.

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