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  4. The current-voltage graph for a device is shown in figure. The resistance is negative in region

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Q. The current-voltage graph for a device is shown in figure. The resistance is negative in regionPhysics Question Image

NEETNEET 2022

Solution:

$R=\frac{\Delta V}{\Delta i}$ is negative, when current decreases with increase of potential difference. This is exhibited by part $A B$.