Sorry for bothering u again.
Do you think it is okay to express the position in term of Q1 and Q2 rather than k?
No worries, it’s a pleasure to answer your questions.
Yes, it would be absolutely fine to express the position in terms of e.g. the value Q1/Q2. In fact that’s just what k represents (well, 1/k actually, but …).
Why do you take kQ1=Q2 in the second part of the question?
That’s a good question, that isn’t easy to answer. Basically I did this because it meant that the Q1 and Q2 values could be cancelled out of the equation in line 2, to give us an equation relating r to the ratio k (which I have defined to be Q1/Q2). Just makes the algebra a bit simpler.
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