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JEE Main20203 Sep 2020Morning ShiftPhysicsSemiconductorsActual

When a diode is forward biased, it has a voltage drop of 0 . 5 V . the safe limit of current through the diode is 10 mA . If a battery of emf 1 . 5 V is used in the circuit, the value of minimum resistance to be connected in series with the diode so that the current does not exceed the safe limit is :

Options

  1. A300   Ω
  2. B50   Ω
  3. C100   Ω
  4. D200   Ω

Correct answer

C. 100   Ω

Step-by-step solution

V d i o d e = 0 . 5   volt V R = 1 . 5 - 0 . 5 = 1   volt iR = 1 R = 1 i = 1 10 - 2 = 100   Ω

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