( Below ( ( are ( ( ( ( a set ) ( of ( ( ( electric ( field lines ) ) and ) ( equipotential surfaces ) ) ) ) ( caused ( by ( ( a ( certain set ) ) ( of ( point charges ) ) ) ) ) ) ( -LRB- ( ( taken ( from ( ( page 588 ) ( of ( the textbook ) ) ) ) ) -RRB- ) ) ) ) . ) )
(ROOT (S (NP (NNP Below)) (VP (VBP are) (NP (NP (NP (DT a) (NN set)) (PP (IN of) (NP (NP (JJ electric) (NN field) (NNS lines)) (CC and) (NP (JJ equipotential) (NNS surfaces))))) (VP (VBN caused) (PP (IN by) (NP (NP (DT a) (JJ certain) (NN set)) (PP (IN of) (NP (NN point) (NNS charges)))))) (PRN (-LRB- -LRB-) (VP (VBN taken) (PP (IN from) (NP (NP (NN page) (CD 588)) (PP (IN of) (NP (DT the) (NN textbook)))))) (-RRB- -RRB-)))) (. .)))
Below are a set of electric field lines and equipotential surfaces caused by a certain set of point charges (taken from page 588 of the textbook).
(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))))))) (. .)))