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(D) When a potential difference is applied between $A$ and $B$ such that $A$ is at a higher potential $(+)$ and $B$ is at a lower potential $(-)$,the

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$35$

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(D) When a potential difference is applied between $A$ and $B$ such that $A$ is at a higher potential $(+)$ and $B$ is at a lower potential $(-)$,the upper diode becomes forward-biased and acts as a short circuit (zero resistance).The lower diode becomes reverse-biased and acts as an open circuit (infinite resistance).In this state,the circuit simplifies to a series combination of the $20\,\Omega$ resistor and the $15\,\Omega$ resistor.Therefore,the equivalent resistance $R_{eq} = 20\,\Omega + 15\,\Omega = 35\,\Omega$.

Two ideal diodes are connected in the network as shown in the figure. The equivalent resistance between $A$ and $B$ is $.......\Omega$.

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