The core of a transformer is laminated in order to
- A. make it lighter
- B. increase the flux through it
- C. reduce energy lost as heat through eddy currents in the core
- D. insulate the two coils from each other
Explanation
Thin sheets separated by insulating varnish break up the circulating paths available to eddy currents, so much less energy is dissipated as heat in the core. Soft iron is used because it is easily magnetised and demagnetised, keeping hysteresis loss low as well. The coils are insulated separately by the enamel on the wire.