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Pick out the expression of electric potential energy from the following.
a) U = 1(4πεo)×[q1q2r]
b) U = 1 × (4πε_o) × [ q1q2r ]
c) U = 1(4πεo)×[q1q2r]
d) U = 1(4πεo) × [q₁q₂]

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