Final answer:
The electric potential energy, Ue, for charge qy can be calculated using the formula: Ue = ke(q1qy/r1y + q2qy/r2y + q3qy/r3y), where ke is the electrostatic constant, q1, q2, and q3 are the charges, and r1y, r2y, and r3y are the distances between each charge and qy.
Explanation:
The electric potential energy, Ue, for charge qy can be calculated using the formula:
Ue = ke(q1qy/r1y + q2qy/r2y + q3qy/r3y)
where ke is the electrostatic constant, q1, q2, and q3 are the charges, r1y, r2y, and r3y are the distances between each charge and qy.
Substitute the given values into the formula to calculate the electric potential energy.