1. Two identical positive charges are situated at the corners ("1" and "3") of a square (side length a). Let q = 5µC and а %3D 15ст. а 4 a 2 3 a. If a third charge is brought in from far away and...

Extracted text: 1. Two identical positive charges are situated at the corners ("1" and "3") of a square (side length a). Let q = 5µC and а %3D 15ст. а 4 a 2 3 a. If a third charge is brought in from far away and placed at the empty corner labelled as "2" in the picture to make the potential energy of the triple-charge system equals to zero, please determine the type (i.e., positive or negative) and amount of the charge. b. Please briefly explain how the potential energy of the triple-charge system changes when the third charge is brought from infinitely far away to corner "2" of the square.