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Answer: 3. +9 V

Move from A to B and add the potential change across each element.

  • Resistor 2 \(\Omega\) in the direction of current: drop of \(2\times2=4\) V.
  • Cell: we go from the + plate to the - plate, so the potential falls by 3 V.
  • Resistor 1 \(\Omega\): drop of \(1\times2=2\) V.
$$V_B=V_A-4-3-2\Rightarrow V_A-V_B=+9\ \text{V}$$

Option (3).

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report
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