The iron core of a transformer is built from thin insulated sheets mainly to

minimise energy loss caused by eddy currents
reduce its mass
increase its mechanical strength
raise the voltage induced in the secondary coil

Correct answer: minimise energy loss caused by eddy currents

Solution

Using thin insulated sheets for the iron core of a transformer helps to reduce the formation of eddy currents, which are loops of electrical current that can cause energy loss in the form of heat. This design improves the efficiency of the transformer.

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