My teacher wanted to test our understanding before starting a new topic. The question he gave goes something like this
“There are 2 vacuums present here about which there is an abundance of mass of any material (i.e. solid or fluid) surrounding it everywhere. Describe the nature of the movement of the vacuums. Would it be attractive (would they come closer)? Would it be repulsive (would they move farther apart)? or would it be stationary?”
My thoughts: I knew this was a special case and enquired if it were the case of an ‘absolute vacuum’ to which he said “No. Fluctuations in a permeating field do exist but I don't think that would affect the solution.” This led me to think that absence of any material with the presence of the exact opposite of that would mean something similar to the notion of ‘negative mass’ or rather more similar to ‘relativistic mass’. My conclusion was repulsive(I thought about a little sci-fi G.R with negative mass involved). The vacuums would move apart. He told me that I may have gotten 1 or 2 things wrong but the idea basically stays the same. Anybody can confirm this solution in a better manner? Or perhaps suggest counter-intuitive questions such as this which suggest 'other-wise' solutions? Or perhaps is this question right( I have a feeling this might be wrong due to some missing information)?