Show work and explain. Nodal analysis-2 Solve the following circuit using nodal analysis. Answer: VA = 175V, VB = 420V, VC = 1155V. VD = 0V. Nodal analysis-3 Repeat the previous problem. except choose node B as reference (ground) [ Answer: Same as the previous except subtract 420 volts from all the values; Nodal analysis-4 Repeat the previous problem, except choose node C as reference (ground) Solution Here applying NODAL VOLTAGE ANALYSIS to the given circuit we have , (Va-Vc)/7+(Va-Vb)/7+Va=0...................(1) for node 2:- we have Vc-Va/7+Vc-Vb/7= 245A....................(2). For node (3) we have Vb/6+Vb-vA/7+Vb-Vc/7=0.........................(3). Simplifying these three equations we can have 9Va-Vb-Vc=0;................(a) -Va-Vb+2Vc=1715.........(b) -6Va+19Vb-6Vc=0......(c). sOLVING THESE equations we have Va=175V,Vb=420V,Vc=1155V. rEPEAT THE SAME PROCEDURE WITH b GROUNDED. .