( ( ( ( he ( ( ( ( studied ( ( the interaction ) ( of ( ( the ( radioactive ( ` ( rays ' ) ) ) ) ( with ( electric fields ) ) ) ) ) ) , ) and ) ( found ( that ( there ( were ( ( two ( different kinds ) ) ( of particles ) ) ) ) ) ) ) ) - ) ( ( ( ( ( ( ones ( attracted ( to ( ( ( the ( negative pole ) ) , ) ( called ( a particles ) ) ) ) ) ) , ) and ) ( one ( attracted ( towards ( the ( positive pole ) ) ) ) ) ) , ) ( called ( b particles ) ) ) ) . )
(ROOT (S (S (NP (PRP he)) (VP (VP (VBD studied) (NP (NP (DT the) (NN interaction)) (PP (IN of) (NP (NP (DT the) (JJ radioactive) (`` `) (NNS rays) ('' ')) (PP (IN with) (NP (JJ electric) (NNS fields))))))) (, ,) (CC and) (VP (VBD found) (SBAR (IN that) (S (NP (EX there)) (VP (VBD were) (NP (NP (CD two) (JJ different) (NNS kinds)) (PP (IN of) (NP (NNS particles)))))))))) (: -) (S (NP (NP (NP (NNS ones)) (VP (VBN attracted) (PP (TO to) (NP (NP (DT the) (JJ negative) (NN pole)) (, ,) (VP (VBN called) (NP (DT a) (NNS particles))))))) (, ,) (CC and) (NP (NP (CD one)) (VP (VBN attracted) (PP (IN towards) (NP (DT the) (JJ positive) (NN pole))))) (, ,)) (VP (VBD called) (SBAR (S (NP (SYM b)) (VP (VBZ particles)))))) (. .)))
he studied the interaction of the radioactive 'rays' with electric fields, and found that there were two different kinds of particles- ones attracted to the negative pole, called a particles , and one attracted towards the positive pole, called b particles .
(ROOT (S (NP (JJ Electrical) (NN force)) (VP (VBZ has) (NP (JJ negative) (NN attraction))) (. .)))
Electrical force has negative attraction.