# Formula for electric potential energy

by darksyesider
Tags: electric, energy, formula, potential
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 P: 55 In a velocity selector apparatus, i had an electric potential set across two points, and a proton at rest at one end. The potential was 350 V. My instructor used : qV = 1/2 mv^2 to find the velocity at the end of the apparatus. Where did the left hand side of the eqn come from??
Mentor
P: 41,464
 Quote by darksyesider qV = 1/2 mv^2 to find the velocity at the end of the apparatus. Where did the left hand side of the eqn come from??
That describes the energy gained by a charge q moving through a potential difference V. (The work done by the field on the charge.)
 Mentor P: 41,464 You may want to review this: Work done by electric field
 P: 2 Formula for electric potential energy qv=(0.5)mv^2 This expression indicates Kinetic Energy gained by a body with charge q while moving in a region of Electric potential v.

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