( Work ( ( would ( be ( required ( to ( ( move ( a ( positive ( test charge ) ) ) ) ( towards ( ( the sphere ) ( against ( the ( electric field ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Work)) (VP (MD would) (VP (VB be) (VP (VBN required) (S (VP (TO to) (VP (VB move) (NP (DT a) (JJ positive) (NN test) (NN charge)) (PP (IN towards) (NP (NP (DT the) (NN sphere)) (PP (IN against) (NP (DT the) (JJ electric) (NN field))))))))))) (. .)))
Work would be required to move a positive test charge towards the sphere against the electric field.
(ROOT (S (NP (NNP Work)) (VP (VBZ is) (SBAR (WHNP (WP what)) (S (NP (PRP it)) (VP (VBZ is) (VP (VBN called) (SBAR (WHADVP (WRB when)) (S (NP (DT a) (NN charge)) (VP (VBZ moves) (PP (IN against) (NP (DT a) (NN field))))))))))) (. .)))