Question

If the $Si$ diode and the $Ge$ diode start conducting at $0.7\text{V}$ and $0.3\text{V}$ respectively, in the given circuit then the current flow through the resistance in the given circuit is

• A. $2.4\text{mA}$
• B. $3.4\text{mA}$
• C. $2.2\text{mA}$
• D. $3.2\text{mA}$

Answer 1

The correct option is C $2.2\text{mA}$

Using potential difference equation,

$12-V_{Si}-V_{Ge}-(5\times {10}^3)\times i=0$

$\Rightarrow 12-0.7-0.3-5000i=0$

$\Rightarrow i=\frac{11}{5000}=2.2\times {10}^{-3}\text{A}=2.2\text{mA}$

Hence, $\left(C\right)$ is the correct answer.