( ( ( ( EM-a4b ( Charged Rods ) ) and ) ( Aluminum ( Can A ) ) ) ( ( charged ( rod ( can ( be ( used ( to ( pull ( ( a pop ) ( can ( ( by ( ( electrostatic ( induction ( EM-a4a ( Electroscope Charged ) ) ) ) ( by Induction ) ) ) ( ( Charge ( an electroscope ) ) ( by induction ) ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (NNP EM-a4b) (NNP Charged) (NNP Rods)) (CC and) (NP (NNP Aluminum) (NNP Can) (NNP A))) (VP (VBD charged) (SBAR (S (NP (NN rod)) (VP (MD can) (VP (VB be) (VP (VBN used) (S (VP (TO to) (VP (VB pull) (SBAR (S (NP (DT a) (NN pop)) (VP (MD can) (VP (PP (IN by) (NP (NP (JJ electrostatic) (NN induction) (NN EM-a4a) (NNP Electroscope) (NNP Charged)) (PP (IN by) (NP (NNP Induction))))) (VB Charge) (NP (DT an) (NN electroscope)) (PP (IN by) (NP (NN induction)))))))))))))))) (. .)))
EM-a4b Charged Rods and Aluminum Can A charged rod can be used to pull a pop can by electrostatic induction EM-a4a Electroscope Charged by Induction Charge an electroscope by induction.
(ROOT (S (NP (DT A) (PRN (-LRB- -LRB-) (NP (NN n)) (-RRB- -RRB-)) (NN electroscope)) (VP (VBZ is) (VP (VBN used) (S (VP (TO to) (VP (VB study) (NP (NN charge))))))) (. .)))