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For the circuit shown below, the current through the Zener diode is :

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14 mA

Zero

5 mA

9 mA

answer is D.

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Detailed Solution

Assuming zener diode doesnot undergo breakdown,

Current in circuit $= \frac{120}{15000} = 8 m A$

$∴$ Voltage drop across diode $= 80 V > 50 V$ The diode undergo breakdown

Current is $R_{1} = \frac{70}{5000} = 14 m A$

Current is $R_{2} = \frac{50}{10000} = 5 m A$

$∴$ Current through diode $= 9 m A$

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