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Manipal MET2017PhysicsSemiconductors

A p-n junction is designed to withstand current up to a maximum in 10 mA . A resistor R=200 is connected in series with it. When forward biased the diode has a potential drop of 0.5 V . The maximum voltage of the battery required to forward bias the diode is

Options

  1. A2.5 V
  2. B1.5 V
  3. C2 V
  4. D10 V

Correct answer

B. 1.5 V

Step-by-step solution

When emf of cell is E , the potential drop is V=E-i r where i is current and r the internal resistance. aligned & Given, i=10 ~mA =10 10⁻³ ~A , R=200 , & V=0.5 volt. & E=V+ ir & E=0.5+10 10⁻³ 200 & E=1.5 ~V aligned

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