The electric potential energy of two point charges is given as follows:
W=krq1q2 where k=9×109Nm2/C2 is the Coulomb constant, q1=q2≡q=3×10−9C are the charges (equal in this case), and r=2.8m is the distance between the charges. Thus, obtain:
W=9×109⋅2.8(3×10−9)2≈3.0×10−8J ANswer. 3.0×10−8J.
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