Assertion: magnetic field's field line | /r/CapableOf | exert tension
Facets:
value: along their length
type: OTHER
value: like a rubber band
type: MANNER
Source sentences:
text: In ferromagnetic substances like iron and in plasmas, magnetic forces can be understood by imagining that the field lines exert a tension, (like a rubber band) along their length, and a pressure perpendicular to their length on neighboring field lines.