All the bulbs in the circuits are identical, as are all the batteries. Rank the magnitude of the potential difference between points M and N.
The Attempt at a Solution
My most fundamental question is actually which way do I know to take the potential difference of? For instance, in A, should I only take the potential difference of the batter, or the other way round (where the bulbs are)? In fact, scenario C seems even more ambiguous to me... But once I get the direction of the potential difference right, I think I can tackle the problem.
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