Kindly provide the image, related to the question, it is mentioned in the question but it is not attached with the question.
As the diagram of this question is not given, so i am solving it by the approximation.
Let the distance between the potentiality line is x,
We know that "E=\\dfrac{-\\delta V}{\\delta x}"
So, "E=\\dfrac{(12-18)}{d}=\\dfrac{6}{d} volt\/m"
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