The core concentrates the __________, which substantially improves its efficiency.

• A. Magnetic Flux Lines
• B. Electric Current
• C. Thermal Energy
• D. Dielectric Strength

Answer: (A)

Magnetic flux lines are concentrated by a high‑permeability core, creating a low-reluctance path for the magnetic field. This keeps most of the flux within the core and between the windings, enhancing magnetic coupling and allowing energy to be transferred more efficiently. With better coupling, less flux leaks and the magnetizing current required for the same flux decreases, boosting overall efficiency. The other properties—electric current, thermal energy, and dielectric strength—do not explain this improvement because they relate to conduction, heat, and insulation, not magnetic linkage.