( ( Draw ( ( a set ) ( of ( equipotential surfaces ) ) ) ) ( ( ( based ( on ( ( the ( electric ( field lines ) ) ) ( in ( the drawing ) ) ) ) ) below ) . ) )
(ROOT (S (S (VP (VBG Draw) (NP (NP (DT a) (NN set)) (PP (IN of) (NP (JJ equipotential) (NNS surfaces)))))) (VP (VBN based) (PP (IN on) (NP (NP (DT the) (JJ electric) (NN field) (NNS lines)) (PP (IN in) (NP (DT the) (NN drawing))))) (ADVP (RB below))) (. .)))
Draw a set of equipotential surfaces based on the electric field lines in the drawing below.
(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))))))) (. .)))