This is one question part a and b need to be answered

In Figure 25.10a, take 4 to be a negative source charge and 42 to be the test charge. If 42 is initially positive and is changed to a charge of the same magnitude but negative, the potential energy of the two-charge system --Select... increases decrease the potential energy of a pair of like charges is positive whereas the potential energy of a pair of unlike charges is negative. Figure 25.10 Question Details PSE6 25.00x.001. [3471244) A uniform electric field points in the positive x direction, as shown below. Along the two lines, 1 and 2, a plot of the electric potentials as a function of distance along these lines from initial point / to final point fis best described by which plot below? 1.2 dance distance