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Manipal MET2016PhysicsSemiconductors

Two junction diodes one of germanium (Ge) and other of silicon (Si) are connected as shown in figure to a battery of emf 12 V and a load resistance 10 k . The germanium diode conducts at 0.3 V and silicon diode at 0.7 V . When a current flows in the circuit, then the potential of terminal Y will be

Options

  1. A12 V
  2. B11 V
  3. C11.3 V
  4. D11.7 V

Correct answer

D. 11.7 V

Step-by-step solution

Ge conducts at 0.3 V and Si Conducts at 0.7 V . Both Ge and Si are connected in parallel. When current begins to flow, then the potential difference remains at 0.3 V , so no current flows through Si-diode. Potential difference across resistive load =12-0.3=11.7 ~V

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