Question

If $V_A$ and $V_B$ denote the potentials of <!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}--> $\text{A}$ and $\text{B}$, then the equivalent resistance between <!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}--> $\text{A}$ and $\text{B}$ in the given electric circuit is -

• A. $10\Omega \text{if}{V}_A>V_B$
• B. $5\Omega \text{if}{V}_A<V_B$
• C. $5\Omega \text{if}{V}_A>V_B$
• D. $20\Omega \text{if}{V}_A>V_B$

Answer 1

The correct option is C $5\Omega \text{if}{V}_A>V_B$

For forward biasing of the diode, $(V_A>V_B)$


$R_{eq}=\frac{10\times 10}{10+10}=5\Omega$

<!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}--> Hence, $\left(C\right)$ is the correct answer.