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As always, for the question below, do not use underscores, so enter R_1 as
R1, R_2 as
R2, R_3 as
R3, R_4 as
R4, V_S as
VS and I_S as
Use node analysis to calculate the potential at node e_1 as a function of R1, R2, R3, R4, Vs and Is. e_1=
Write an expression for the potential at node e_2 as a function of R1, R2, R3, R4, Vs and Is.