23. A d.c. 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 ?
(a) 2 V when diode is forward biased
(b) Zero when diode is forward biased
(c) V when diode is reverse biased
(d) V when diode is forward biased
Answer : (d) V when diode is
forward biased
| Condition | Forward Bias | Reverse Bias |
|---|---|---|
| Resistance | 0 Ω (zero resistance) | ∞ Ω (infinite resistance) |
| Current Flow | Current flows freely | No current flows |
| Voltage Drop | 0 V (no voltage drop) | Voltage across diode = applied voltage (high) |
| Circuit Relation | V = I × R (only resistor has drop) | Open circuit condition |
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