Question

Current flowing in a Zener diode as shown in circuit is:

(Given diode is an ideal and $V_Z=4\text{V})$

• A. $0.9\text{A}$
• B. $0.1\text{A}$
• C. $0.4\text{A}$
• D. $0.5\text{A}$

Answer 1

The correct option is B $0.1\text{A}$


Given:
$V_Z=4\text{V}$ i.e, potential drop across $10\Omega$ is $4\text{V}$.

Using, $V=iR$

$\Rightarrow i=\frac{V}{R}=\frac{4}{10}=0.4\text{A}$

Voltage drop across $2\Omega$ is $1\text{V}$,

$i_{Net}=\frac{V}{R}=\frac{1}{2}=0.5\text{A}$

$\therefore i_Z=i_{Net}-i$

$=0.5-0.4=0.1\text{A}$

Hence, $\left(\text{D}\right)$ is the correct answer.