I am looking at some circuit solving using the superposition principle and I came across this one.
We need to find \$v_0\$. My thought would be to use superposition and voltage division in the following way:
We in both cases find the voltage across \$2R_a\$ with the voltage divider formula. However, it turns out the solution is actually:
So my denominator and numerator should switch places in the second part of my solution, but I don't understand why this is. Aren't we then finding the voltage across \$R\$? And does that have an effect on \$v_o\$?
I hope someone can clarify this for me.