Magnetic Feilds

• Field force is strongest where the magnetic flux is most dense
• That part is known as the magnetic poles
• The poles are the points at which the magnetic lines of force enter and leave the magnet
  
  
  

Characteristics of Magnetic Lines

• Magnetic lines of force posses direction
• The north pole of a compass always points to the south pole of the magnet
• Magnetic lines of force always from complete loops
• Magnetic lines of force represent tension along there length which tend to make then a short as possible
• Magnetic line of force tend to repel each other
• Magnetic lines of force cannot intersect or cross but will always form individual loops

Magnetic Screen

Screen

• Uses soft iron to shield a device providing an alternate path for magnetic field

Reluctance

• The property that opposes the setting up of flux
• Material with low reluctance tend to concentrate the magnetic field
• Soft iron has a low reluctance