( ( ( ( Two magnets ) or ) ( ( ( a magnet ) and ) ( a ( ferromagnetic ( work piece ) ) ) ) ) ( ( can ( cause ( force interaction ) ) ) . ) )
(ROOT (S (NP (NP (CD Two) (NNS magnets)) (CC or) (NP (NP (DT a) (NN magnet)) (CC and) (NP (DT a) (JJ ferromagnetic) (NN work) (NN piece)))) (VP (MD can) (VP (VB cause) (NP (NN force) (NN interaction)))) (. .)))
Two magnets or a magnet and a ferromagnetic work piece can cause force interaction.
(ROOT (S (S (VP (VBG Increasing) (NP (NP (DT the) (NN distance)) (PP (IN between) (NP (DT the) (CD two) (NNS magnets)))))) (VP (MD will) (VP (VB cause) (NP (DT a) (NN decrease)) (PP (IN in) (NP (NP (DT the) (NN force)) (PP (IN of) (NP (NP (NN attraction)) (PP (IN between) (NP (CD two) (NNS magnets))))))))) (. .)))
Increasing the distance between the two magnets will cause a decrease in the force of attraction between two magnets.