Which term describes a closed loop of magnetic flux that forms part of the magnetic circuit?

Which term describes a closed loop of magnetic flux that forms part of the magnetic circuit?

• A. Flux lines
• B. Flux density
• C. Magnetic circuit
• D. Permeability

Answer: (C)

Magnetic flux always forms closed loops because there are no magnetic monopoles. The path the flux takes through the iron parts and any air gaps, returning to the opposite pole, is the magnetic circuit. A closed loop of flux that is part of that path is simply a segment of the magnetic circuit, since the circuit is defined by the complete loop the flux follows. The other terms describe the field more generally or in terms of quantities: flux lines are the visual guide of direction, flux density is how much flux per unit area, and permeability is a material property that affects how easily flux flows. None of those describe the actual loop geometry or path, which is captured by the idea of the magnetic circuit.

Magnetic flux always forms closed loops because there are no magnetic monopoles. The path the flux takes through the iron parts and any air gaps, returning to the opposite pole, is the magnetic circuit. A closed loop of flux that is part of that path is simply a segment of the magnetic circuit, since the circuit is defined by the complete loop the flux follows. The other terms describe the field more generally or in terms of quantities: flux lines are the visual guide of direction, flux density is how much flux per unit area, and permeability is a material property that affects how easily flux flows. None of those describe the actual loop geometry or path, which is captured by the idea of the magnetic circuit.