Which one formula is correct for electric field strength? All Questions › Category: Electrical › Which one formula is correct for electric field strength? -1 Vote Up Vote Down Rajasri Mundrathi Staff asked 3 years ago Options: a) E = πD2.b) E = πD.c) E = D2 / ε.d) E = D / ε. 1 Answers 0 Vote Up Vote Down Rajasri Mundrathi Staff answered 3 years ago The correct answer is E = D / ε.