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Q.

From the circuit shown below, the maximum and minimum values of Zener diode current are

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a

6 mA,5 mA

b

14 mA, 5mA

c

9mA, 1mA

d

3mA, 2mA

answer is C.

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Detailed Solution

R=5kΩ=5000ΩVin(min)=80V Vin(max)=120VVZ=50V RL=10kΩ=10000ΩIZ(min)=?IZ(max)=?Let Vin=80V     Vin=IR+VZ⇒80=I5000+50⇒30=I5000   ⇒I=305000=305×1000=6×10−3A=6mAWe know, I=IZ+IL⇒6mA=IZ+VoRo=IZ+5010000=IZ+5×10−3⇒6mA=IZ+5mA ⇒IZ=1 mA  Let Vin=120VVin=IR+VZ⇒120=I5000+50⇒70=I5000⇒I=705000=14mAWe know, I=IZ+IL⇒14mA=IZ+5×10−3=IZ+5mA⇒9mA=IZ(max)
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From the circuit shown below, the maximum and minimum values of Zener diode current are