Answer:
b) V_CD = - V_AB , c) V_AD = -2 V_AB
Explanation:
b) In this exercise of potential differences they indicate that the diagonal potential is the negative of the leg potential
V_AC = - V_AB
V_BD = - V_CD
Thus
V_CD = V_AC
Finally
V_CD = - V_AB
c) The potential is a scalar quantity so it can be added algebraically, they give us the condition
V_AC = -V_AB
V_AB + V_BC = - V_AB
V_BC = - 2 V_AB
For the other triangle
V_BD = V_AC
V_AB + V_AD = V_AC
We replace
V_AB + V_AD = - V_AB
V_AD = -2 V_AB