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EK Physics page 126 error about capacitors?

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7+ Year Member
Feb 16, 2009
  1. Medical Student
On page 118, it says the potential energy for a charge in an electric field is U = qEd. And we know that V = Ed. So shouldn't U = qV?

I think you are getting confused between q and Q. q refers to just a point charge and the potential energy equation on page 118 applies to point charges only. On the other hand, Q is total charge on either plate of the parallel plate capacitor.
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