How much energy does it take to move 10 coulombs from infinity to 1 meter? In this video, Purdue University Professor of Electrical and Computer Engineering, Michael Melloch, calculates this by explaining the potential difference between two points and how it relates to work. Prof. Melloch enlightens us how that 9 volts of potential difference translates into 90 joules of work to move 10 coulombs. He then dives into finding the value of the point charge at the origin by integrating equation for potential difference, which involves the electric field intensity over 4πε₀ times r. Finally, he reveals that the charge, q, is equal to 10^(-9) volts, or 1 nano coulomb, a unit also known as a Faraday serry or Coulomb probe.
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