How can the loss of energy due to eddy current be minimised?

Eddy currents are-

What are eddy currents ? How are these produced ? How eddy currents can be minimized in a transformer.

What are eddy currents ? Give some applications of eddy currents. How can the eddy currents be minimised ?

State and explains the three modes of transfer of heat. Explains how the loss of heat due to these three modes is minimised in a thermos flask.

If mu and mu_(2) are the refractive indices of the materials of core and cladding of an optical fibre, then loss of light due to its leakage can be minimised by having