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  4. The equivalent resistance of the circuit shown in figure between the points A and B if VA < VB is , the equivalent resistance between the points A and B, if VA > VB is

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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
, the equivalent resistance between the points $A$ and $B$, if $V_A > V_B$ is

Semiconductor Electronics: Materials Devices and Simple Circuits

Solution:

When $V_A > V_B$ the diode gets forward biased and offers no resistance.
$\therefore R = \frac{20\times 20}{20 + 20} = 10\,\Omega$