( ( The ( magnetic force ) ) ( ( can ( ( cause ( two ( parallel wires ) ) ) ( to ( attract ( if ( they ( ( are both ) ( carrying ( ( an ( electric current ) ) ( -LRB- ( ( that ( ( is , ) ( ( a flow ) ( of electrons ) ) ) ) -RRB- ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT The) (JJ magnetic) (NN force)) (VP (MD can) (VP (VB cause) (NP (CD two) (JJ parallel) (NNS wires)) (S (VP (TO to) (VP (VB attract) (SBAR (IN if) (S (NP (PRP they)) (VP (VBP are) (ADVP (DT both)) (VP (VBG carrying) (NP (NP (DT an) (JJ electric) (NN current)) (PRN (-LRB- -LRB-) (SBAR (WHNP (WDT that)) (S (VP (VBZ is) (, ,) (NP (NP (DT a) (NN flow)) (PP (IN of) (NP (NNS electrons))))))) (-RRB- -RRB-)))))))))))) (. .)))
The magnetic force can cause two parallel wires to attract if they are both carrying an electric current (that is, a flow of electrons).
(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.