Modern Physics 6 Question 12

13. For the circuit shown below, the current through the Zener diode is

(Main 2019, 10 Jan II)

(a) 14mA

(b) zero

(c) 5mA

(d) 9mA

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Solution:

  1. In the circuit, let the current in branches is as shown in figure below

By Kirchhoff’s node law,

I1=I2+I3

Now, when diode conducts, voltage difference between points A and B will be

VAB=12050=70V

So, current I1=VAB5kΩ=705×103

I1=14mA

Since, diode and 10kΩ resistor are in parallel combination, so voltage across 10kΩ resistor will be 50V only.

I3=5010kΩ=5010×103I3=5mA

From Eqs. (i), (ii) and (iii), we get

14mA=I2+5mA

or current through diode,

I2=14mA5mA=9mA



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