Three charges are located at the vertices of a triangle, as shown.

an isosceles triangle lying on its side. the two charges at the corners of the base of the isosceles triangle are labeled +5 c and +10 c. the top of the triangle is labeled +4 c with 4 vectors from it. the one east is labeled y, the one west is labeled w, the one northeast is labeled x and the one southeast is labeled z.

which vector best represents the net force acting on the +4 c charge in the diagram?

w

x

y

z