Question

From the graph between current (I) and voltage (V) is shown below. Identify the portion corresponding to negative resistance

• A. CD
• B. DE
• C. AB
• D. BC

Answer 1

The Correct Option is A

The graph provided is a typical current (I) versus voltage (V) characteristic curve. To determine the portion corresponding to negative resistance, we need to understand the concept of negative resistance first.

In a typical circuit, if the resistance is positive, an increase in voltage across the device results in an increase in current. Conversely, if the resistance is negative, an increase in voltage results in a decrease in current.

Let's analyze each portion of the graph:

1. Segment AB: Current increases with an increase in voltage, indicating positive resistance.
2. Segment BC: Current continues to increase, albeit at a slower rate, indicating positive resistance.
3. Segment CD: In this portion, as voltage increases, the current decreases. This behavior is characteristic of negative resistance.
4. Segment DE: Current starts increasing again with an increase in voltage, indicating positive resistance.

Therefore, the segment CD exhibits negative resistance as an increase in voltage results in a decrease in current.

Conclusion: The portion of the graph corresponding to negative resistance is CD.