STANDARD Physics Diode Characteristics MCQ Question
The following table provides the set of values of V and I obtained for a given diode. Let the characteristics α be nearly linear, over this range, the forward and reverse bias resistance of the given diode respectively are
| V | I | |
|---|---|---|
| Forward biasing | 2.0 V | 60 mA |
| 2.4 V | 80 mA | |
| Reverse biasing | 0 V | 0 μA |
| −2 V | −0.25 μA |
10 Ω, 8 × 10⁶ Ω
20 Ω, 4 × 10⁵ Ω
20 Ω, 8 × 10⁶ Ω
10 Ω, 10 Ω
Correct Answer
Detailed Explanation
For forward biasing, ΔV = 2.4 − 2.0 = 0.4 V and I = 80 − 60 = 20 mA, so rₓ = ΔV/ΔI = 0.4/20×10⁻³ = 20 Ω. For reverse biasing, ΔV = −2 − 0 = −2 V and I = −0.25 − 0 = −0.25 μA, so rₓ = −2/−0.25×10⁻⁶ = 8 × 10⁶ Ω.
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