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The values of voltage $\left(\mathrm{V}_{\mathrm{D}}\right)$ across a tunnel-diode corresponding to peak and valley currents are $\text{V}_{\text{P}}$ and $\text{V}_{\text{V}}$ respectively. The range of tunnel-diode voltage $\text{V}_{\text{D}}$ for which the slope of its $\text{I}-\text{V}_{\text{D}}$ characteristics is negative would be

  1. $\mathrm{V}_{\mathrm{D}}<0$
  2. $0 \leq \mathrm{V}_{\mathrm{D}}<\mathrm{V}_{\mathrm{P}}$
  3. $\mathrm{V}_{\mathrm{P}} \leq \mathrm{V}_{\mathrm{D}}<\mathrm{V}_{\mathrm{V}}$
  4. $\mathrm{V}_{\mathrm{D}} \geq \mathrm{V}_{\mathrm{V}}$
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