Which component concentrates magnetic flux lines?

• A. Core
• B. Windings
• C. Lightning Arrestor
• D. Insulating Fluid

Answer: (A)

Concentrating magnetic flux lines is achieved by providing a path with very high magnetic permeability and thus low reluctance. The transformer core serves this role, typically made of laminated steel to maximize this effect. It forms a tight, low-reluctance path that channels and concentrates the magnetic flux between the windings, improving coupling and reducing leakage. The windings themselves carry current to create the flux but do not provide the concentrated path. Lightning arrestors are for surge protection, and insulating fluid mainly insulates and cools; neither guides magnetic flux.