question_answer

From the zener diode circuit shown in figure, the current through the zener is-                     

A) 34 mA              

B) 31.5 mA

C) 36.5 mA                       

D) 2.5 mA

Correct Answer: B

Solution :

\[{{i}_{1}}\,=\,\frac{50}{20\times {{10}^{3}}}\,\,\,\Rightarrow \,\,2.5\,mA\] \[i\,\,=\,\,\frac{220-50}{5\times {{10}^{3}}}\,\,\,\Rightarrow \,\,\frac{170}{5\times {{10}^{3}}}\,\,\Rightarrow \,\,32\,mA\] \[{{i}_{1}}+{{i}_{2}}=i\] \[2.5+{{i}_{2}}=32\] \[{{i}_{2}}\,\,=\,\,31.5\,mA\]