( ( Construct ( ( the ( electric ( field lines ) ) ) ( that ( produced ( the ( equipotential lines ) ) ) ) ) ) . )
(ROOT (S (VP (VB Construct) (NP (NP (DT the) (JJ electric) (NN field) (NNS lines)) (SBAR (WHNP (WDT that)) (S (VP (VBD produced) (NP (DT the) (JJ equipotential) (NNS lines))))))) (. .)))
Construct the electric field lines that produced the equipotential lines.
(ROOT (S (SBAR (IN Since) (S (NP (DT the) (JJ electric) (NN field) (NNS lines)) (VP (VBP point) (ADVP (RB radially)) (ADVP (RB away) (PP (IN from) (NP (DT the) (NN charge))))))) (, ,) (NP (PRP they)) (VP (VBP are) (ADJP (JJ perpendicular) (S (VP (TO to) (VP (VB equipotential) (NP (NNS lines))))))) (. .)))