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A dc battery of V volt is connected to a series combination of a resistor R and an ideal diode D as shown in the figure below. The potential difference across R will be

1. 2V when diode is forward biased
2. Zero when diode is forward biased
3. V when diode is reverse biased
4. V when diode is forward biased

Correct answer: V when diode is forward biased

Solution

When the diode is forward biased, it conducts, and the entire voltage V appears across the resistor R as the diode is ideal and has zero resistance. In reverse bias, the diode does not conduct, and no current flows, so the potential difference across R is zero.

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