Alright, I think I got it.
I set V1 = ε1 - ir1 = 0
and got ε1 = ir1
and also
ε2 = ir2
Subbing 'i' into the equation I had simplified to above produces, for emf #1, I get R to equal .004Ω (which is what the back of the book says). Doing the same for emf #2, I get -.004Ω.
My only...
Homework Statement
ε[1]=12v
internal resistance[1]=.016Ω
ε[2]=12v
internal resistance[2]=.012Ω
some unknown resistance 'R' in a stand alone resistor.
a) what value of 'R' will make the terminal-to-terminal potential difference of one of the batteries zero?
b) which battery would it be...