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the potential on the first wire is 5/15 * 2 = 2/3 V
potential in the second wire is 10/15 * 2= 4/3 V
their difference is 2/3 V
which is potential difference.
i know why you are confused.
the place where the wire is joining is actually where there is a little dot. that is junction. where the wire pass straight through it is not a junction.
this might help
Actually Suchal, the potential at the terminal in the first wire is 10/15 *2. Had there been resistors of different resistances, you would have gotten the wrong answer. At the terminal in the second wire, it would be 5/15 *2. Your answer gives a negative value, which is not same as the positive value anyway
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