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Ampere definition | Moving charges and magnetism | Physics | Khan Academy

Let's explore the definition of Ampere. Until quite recently, the Ampere was defined to be that current which when passed through two long straight wires kept 1 meter apart in a vacuum, attracted each other with a force per unit length of 2 X 10^-7 N/m. [The definition was revised in May 2019] More information here https://en.wikipedia.org/wiki/2019_re... Khan Academy is a nonprofit organization with the mission of providing a free, world-class education for anyone, anywhere. We offer quizzes, questions, instructional videos, and articles on a range of academic subjects, including math, biology, chemistry, physics, history, economics, finance, grammar, preschool learning, and more. We provide teachers with tools and data so they can help their students develop the skills, habits, and mindsets for success in school and beyond. Khan Academy has been translated into dozens of languages, and 15 million people around the globe learn on Khan Academy every month. As a 501(c)(3) nonprofit organization, we would love your help! Donate here: https://www.khanacademy.org/donate?ut... Created by Mahesh Shenoy