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==Key Stage 5==
===Meaning===
'''Field lines''' are imaginary lines used to represent the direction and strength of a [[Force Field|field]], such as [[Electric Field|electric]], [[Magnetic Field|magnetic]], or [[Gravitational Field|gravitational fields]].
===About Field Lines===
*[[Electric Field|Electric]] '''field lines''' point away from [[Positive Charge|positive charges]] and towards [[Negative Charge|negative charges]].
*[[Magnetic Field|Magnetic]] '''fieldlines''' lines form closed loops, emerging from the [[North Seeking Pole|north pole]] and entering the [[South Seeking Pole|south pole]] of a [[magnet]].
*[[Gravitational Field|Gravitational]] '''field lines''' point towards the [[Centre of Mass|centre of mass]].
*The [[density]] of the '''field lines''' indicates the strength of the [[Force Field|field]]; closer lines represent a stronger [[Force Field|field]].
*'''Field lines''' never cross each other.
*'''Field lines''' provide a visual representation of the force experienced by a test particle placed in the [[Force Field|field]].