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In the circuit shown in the figure, if the potential at point A is taken to be zero, the potential at point B is

Asked in CBSE AIPMT 2011 Mains · Kirchhoff's laws in networks

• (1) +1 V
• (2) -1 V
• (3) +2 V
• (4) -2 V

Step-by-step solution

Why the other options are wrong

• (2) Reads the 1 V cell backwards (as a fall from A to C): then V_C=-1, V_D=+1 and V_B=-1 V.
• (3) No single slip gives +2 V: it would need V_D=4 V, i.e. a 3 V drop across the 2 Ω resistor that carries only 1 A.
• (4) Needs V_D=0, which only happens if the 1 V cell and the 2 V drop across the 2 Ω resistor are both left out; two slips, not one.

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