a point charge q2 is held stationary at the origin. A second charge q1 is placed at point b, and the electric potential energy of the pair of charges is +5.4x10^-8 J. When the second charge is moved to point a, the electric force on the charge does -1.9x10^-8 J of work. What is the electric potential energy of the pair of charges when the second charge is at point a?

+Q +Q -a +Q + a + 2a A positive point charge +Q is located at x = -a. Assuming that the electric potential at infinity is zero, what is the electric potential energy of the system after an external agent brings in a second equal positive charge +Q from infinity to x = +a? (b) With the two equal point charges at x = -a and x = +a, what is the total electric potential energy of the system when an external agent brings in a third charge -Q from infinity to the origin? (c) By how much does the electric potential energy change when the charge - Q is moved from the origin to the point x = +2a along the semicircular path shown? Hint: how is the electric potential energy related to the electric potential? +Q Q: 0 +a

In the figure shown below, q = 2.0 x 10-9 C and d = 1.2 m. The electric potential at point P located at the center of the square is: -2.0q -3.0q d- d •P d d- -2.09 +5.0q

A charged particle with -0.41 C of electric charge is placed in a point in the space where the electrical potential is 27.3 V. What is the electrical potential energy of the particle in the unit of J?