Determine the current through zener diode for the circuit shown in figure is: (Given: zener diode break down voltage $$V_z=5.6V$$)
A
$$7mA$$
B
$$15mA$$
C
$$10mA$$
D
$$17mA$$
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Solution
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Correct option is C. $$10mA$$ For zener brak down potential difference across $$800\Omega $$ resistor will be $$5.6V$$4 $$V_z=5.6V$$ $$i_2=\dfrac{V_z}{800}=\dfrac{5.6}{800}=7mA$$ $$\Delta V$$ across $$200\Omega =9-5.6=3.4V$$ $$i_1=\dfrac{3.4}{200}=17mA$$ $$i_1=1_2+i_z$$ $$i_z=17mA-7mA=10mA$$
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