A proton is a distance d/2 directly abovePublished February 7, 2017 at dimensions 357 × 169 in A proton is a distance d/2 directly above. https://www.questionsolutions.com/wp-content/uploads/2017/02/sqq1.pngImage from: J. Walker, D. Halliday, and R. Resnick, Fundamentals of physics: [extended], 10th ed. United States: Wiley, John & Sons, 2013.