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Answer:
(i) Va = -500V
Vb = 1200V
Vab = Vb - Va
= 1200 - (-500)
=1200+ 500
=1700V.
(ii) electron will flow from -ve to + ve termibal of wire i.e., from A to B.
(iii) When the potential of both conductor A and B will become equal i.e., Va = Vb