Matter in which particles are arranged in repeating geometric patterns is a

that would be b i just took the test : )

two charges are fixed in place on the x-axis as shown. the charge at x = 0 is negative and has magnitude q = 2 μcoulombs (1 μcoulomb = 10-6 coulombs). the charge at x = d, (d = +12 cm), is positive and has magnitude q = 4 μcoulombs. find a point x = xo along the x-axis at which the electric field is zero.

okay i have so many questions. but the big one here is: um wt..f is this mess? ?