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Unformatted text preview: Let’s turn to the equation for change in electric
potential energy. The value would be the same, but the potential energy
would have decreased instead of increased. Direct Approaches Electric Potential Energy → Source q1 exerts F on test q2 Source q1 stores UE w/ test q2 r [m] N·m2
9 ± [N·m] = [J] UE = k q1 q2 [C][C] ←± ±→
→± ← !UE = ± Electric Potential Energy →± ±←
←± → (–) decreases Source q1 stores UE w/ test q2 (+) increases Electric Potential Energy Let’s say we have a positively charged ﬂoor.
What will the electric ﬁeld look like?
Now let’s say that an unknown charged
object that is originally far away from the
ﬂoor is brought in closer to the ﬂoor.
Has the electric potential energy of the
object increased or decreased?
We are not
sure. It is
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