Similarities Between Activity of Gravitational and Electric Fields on an Object
The charge, +q, is moved down the electric field in the same way that the object, m, is moved down the hill. In both instances, the particle in motion goes from a higher to a lower potential energy state.
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"OpenStax College, Electric Potential Energy: Potential Difference. January 3, 2013."
http://cnx.org/content/m42324/latest/
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