( ( By symmetry ) ( , ( ( the ( electric field ) ) ( ( must ( ( ( ( point radially ) ( away ( from ( ( the line ) ( of charge ) ) ) ) ) and ) ( be ( uniform ( along ( its length ) ) ) ) ) ) . ) ) ) )
(ROOT (S (PP (IN By) (NP (NN symmetry))) (, ,) (NP (DT the) (JJ electric) (NN field)) (VP (MD must) (VP (VP (VB point) (ADVP (RB radially)) (PP (RB away) (IN from) (NP (NP (DT the) (NN line)) (PP (IN of) (NP (NN charge)))))) (CC and) (VP (VB be) (ADJP (JJ uniform) (PP (IN along) (NP (PRP$ its) (NN length))))))) (. .)))
By symmetry, the electric field must point radially away from the line of charge and be uniform along its length.
(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))))))) (. .)))