( Furthermore ( , ( ( equipotential surfaces ) ( ( ( are always ) ( perpendicular ( to ( ( the ( net ( electric ( field lines ) ) ) ) ( passing ( through it ) ) ) ) ) ) . ) ) ) )
(ROOT (S (ADVP (RB Furthermore)) (, ,) (NP (JJ equipotential) (NNS surfaces)) (VP (VBP are) (ADVP (RB always)) (ADJP (JJ perpendicular) (PP (TO to) (NP (NP (DT the) (JJ net) (JJ electric) (NN field) (NNS lines)) (VP (VBG passing) (PP (IN through) (NP (PRP it)))))))) (. .)))
Furthermore, equipotential surfaces are always perpendicular to the net electric field lines passing through it.
(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))))))) (. .)))