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NEET 2011
Exam
NEET
Year
2011
Subject
Physics
Chapter
Semiconductors

NEET 2011 · Physics · Semiconductors

A zener diode, having breakdown voltage equal to 15 ~V , is used in...

A zener diode, having breakdown voltage equal to 15 V15 \mathrm{~V}, is used in a voltage regulator circuit shown in figure. The current through the diode is A zener diode, having breakdown voltage equal to 15 ~V , is used in a voltage regulator circuit shown in figure. The

Options

  1. A10 mA10 \mathrm{~mA}
  2. B15 mA15 \mathrm{~mA}
  3. C20 mA20 \mathrm{~mA}
  4. D5 mA5 \mathrm{~mA}

Correct answer

D. 5 mA5 \mathrm{~mA}

Step-by-step solution

A zener diode, having breakdown voltage equal to 15 ~V , is used in a voltage regulator circuit shown in figure. The
For I 1kΩ1 \mathrm{k} \Omega i_1=151=\frac{15}{1}=15  mA\mathrm{~mA}For II 250Ω250 \Omegai250Ω=20−15250=5250=201000=20 mA∴izener =20−15=5 mA\begin{aligned}& i_{250 \Omega}=\frac{20-15}{250}=\frac{5}{250}\\ &=\frac{20}{1000}=20 \mathrm{~mA}\\ & \therefore \quad i_{\text{zener }}=20-15=5 \mathrm{~mA} \end{aligned}$$
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