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COMEDK20269 May 2026Evening ShiftPhysicsCurrent ElectricityActual

Find the current through the 40 resistor in the given circuit having a diode, three resistors and two cells.

Options

  1. A0.5 A
  2. B1.2 A
  3. C2.1 A
  4. D0.21 A

Correct answer

D. 0.21 A

Step-by-step solution

Let the potential of the common right wire be 0 V. Observe the battery symbols to determine their polarities. For the 10 V battery, the longer line is on the right, so its positive terminal is on the right. For the 5 V battery, the longer line is on the left, so its positive terminal is on the left. Therefore, the potential at the node between the 30 resistor and the 10 V battery is -10 V. The potential at the bottom-left node, connected to the positive terminal of the 5 V battery, is +5 V. Let V_A be the potential

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