In the circuit shown, current through the 4 Ω resistor is 1 A. When the points P and M are connected, the potential difference between M and N is: [Diagram: Image]
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In the circuit shown, current through the 4 Ω resistor is 1 A. When the points P and M are connected, the potential difference between M and N is: [Diagram: Image]

G1 Physics · Accepted Answer

Step 1: Use current division in the two loops shown. Step 2: 4 Ω carries 1 A so its potential drop is 4 V. Step 3: Combine the 0.5 Ω source resistances and 1 Ω connecting segment using Kirchhoff laws. Step 4: Printed key gives 3.2 V.