Answer: Using laminated soft iron core to minimize eddy currents.
- A Using laminated soft iron core to minimize eddy currents
- B Using thick copper windings to raise winding resistance
- C Increasing the primary voltage applied to the coil
- D Decreasing the number of turns on the secondary winding
Correct answer: A. Using laminated soft iron core to minimize eddy currents
Explanation: Eddy current losses are reduced by laminating the core (thin insulated sheets). Hysteresis losses are reduced by using soft iron (low coercivity).
In a pure inductor the current lags the voltage by 90° (energy is briefly stored in the magnetic field before current responds); in a pure capacitor the current leads the voltage by 90° (current must flow to build up charge before voltage rises) - the mnemonic "ELI the ICE man" keeps these straight.
Concept context
AC circuits, impedance, LCR series circuit, resonance, transformers, and power factor.