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JEE Main201912 Apr 2019Evening ShiftPhysicsSemiconductorsActual

Figure shows a D C voltage regulator circuit, with a Zener diode of breakdown voltage = 6 V . If the unregulated input voltage varies between 10 V to 16 V , then what is the maximum Zener current?

Options

  1. A1.5 m A
  2. B3.5   mA
  3. C7.5 m A
  4. D2.5 m A

Correct answer

B. 3.5   mA

Step-by-step solution

Current through 2   K Ω is i   =   10 2000   =   5   m A Current through 4   K Ω i L = i - i z = 6 4000   = 1.5   m A ⇒   i z = i - 1.5   ∴ i z = 5 - 1 .5 = 3 .5   mA

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