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  2. AP Physics 2 Revised
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Define Electric Potential Energy.

Work done by an external force to bring charges from infinitely far apart to their current positions; stored energy ready to do work.

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Define Electric Potential Energy.

Work done by an external force to bring charges from infinitely far apart to their current positions; stored energy ready to do work.

What is UEU_EUE​ in the context of Electric Potential Energy?

Electric potential energy, measured in Joules (J).

Define 'q' in the Electric Potential Energy formula.

The charge of an object, measured in Coulombs (C).

What is 'r' in the Electric Potential Energy formula?

The distance between the charges, measured in meters (m).

Define Coulomb's constant (k).

A constant equal to 8.99imes1098.99 imes 10^98.99imes109 N⋅m²/C² or 14πε0\frac{1}{4 \pi \varepsilon_{0}}4πε0​1​.

Define ε0\varepsilon_0ε0​.

Permittivity of free space constant (8.85imes10−128.85 imes 10^{-12}8.85imes10−12 C²/N⋅m²).

Differentiate between positive and negative electric potential energy.

Positive: Like charges, requires work to bring together. Negative: Unlike charges, attract each other, requires work to separate.

How is electric potential energy related to electric potential (voltage)?

Electric potential energy is the energy a charge has due to its position in an electric field; related to electric potential (voltage) by UE=qVU_E = qVUE​=qV.

How do you calculate the total electric potential energy for a system with multiple charges?

Calculate the potential energy for every unique pair of charges and then sum them up.

What is the first step in solving an electric potential energy problem?

Draw a diagram to visualize the problem and identify all charges and distances.