( Charged ( ( object ( touches ( the electroscope ) ) ) . ) )
(ROOT (S (NP (NNP Charged)) (VP (VBP object) (S (NP (NNS touches)) (NP (DT the) (NN electroscope)))) (. .)))
Charged object touches the electroscope.
(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))))))) (. .)))