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  4. The equivalent resistance of the circuit shown in figure between the points A and B if VA < VB is <img class=img-fluid question-image alt=image src=https://cdn.tardigrade.in/img/question/physics/297086f7f3c28b6f0a2a2e61a5ffb935-.png />

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Q. The equivalent resistance of the circuit shown in figure between the points $A$ and $B$ if $V_A < V_B$ is
image

Semiconductor Electronics: Materials Devices and Simple Circuits

Solution:

When $V_A < V_B$ the diode gets reverse biased and offers infinite resistance. No current flows through the upper branch
$\therefore R = 20\,\Omega$