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For the circuit shown below, calculate the value of $I_{Z} :$

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25mA

0.15 A

0.1 A

0.05 A

answer is A.

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Detailed Solution

In the given circuit, the zener diode is used as a voltage regulating device. Hence, the voltage across $2000 Ω$ is 30 V.

Current flowing through $1000 Ω, I = \frac{100 - 50}{1000} = 50 m A$

Current flowing through $2000 Ω, I' = \frac{50}{2000} = 25 m A$

Using Kirchhoff’s current law, $I = I_{2} = I' \Rightarrow I_{Z} = I - I = 50 - 25 = 25 m A$

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