In the network shown the potential difference between $A$ and $B$ is ................. $V$ $(R = r_1 = r_2 = r_3 = 1 \Omega$ ,$ E_1 = 3\, V, E_2 = 2\, V, E_3 = 1\, V)$
  • A$1$
  • B$2$
  • C$3$
  • D$4$
Medium
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