In this problem we will explore whether the electric forces on the PIP2 molecules in this model cluster tends to pull it together or blow it apart. (a) What is the net electric force on the central PIP2 molecule in the cluster coming from all the other charges in the cluster? (b) To find out whether the electric forces pull the PIP2 molecules in the cluster together or blow them apart, we only have to consider one of the PIP2 molecules, say the one at the very top. Explain why. (c) The total force on the top ion will look like a pure number times the expression kCe2/s2. Explain why this is true. Your explanation could involve a consideration of each force or use dimensional analysis (or you might come up with something else). (d) Find the net force on the top ion exerted by the other ions by finding the number that multiplies the expression given in part (c). What direction does it point? Does this force push the top ion toward the center (tending to hold the cluster together) or push it away (tending to blow the cluster apart)? Explain your reasoning carefully, showing with diagrams which forces