Graph showing the variation of current versus voltage for a material GaAs is shown in the figure...

Описание: Question [CBSE 2015 – Delhi]
Graph showing the variation of current versus voltage for a material GaAs is shown in the figure. Identify the region of
(i) negative resistance
(ii) where Ohm’s law is obeyed.

In this video, Saif Sir explains the CBSE Class 12 Physics Previous Year Question from Chapter 3 – Current Electricity based on the V-I characteristics of GaAs (Gallium Arsenide).

You will clearly understand:
• What is negative resistance region
• Where Ohm’s Law is valid on the V-I graph
• Board exam answer writing technique
This question is very important for CBSE Boards, NEET, JEE Mains & CUET.

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Summary of Video

The video explains how to identify regions of negative resistance and where Ohm's Law is obeyed on a current-voltage (V-I) graph for a material like Gallium Arsenide (GaAs), as per a CBSE 2015 Physics question.

Here's a breakdown of the key points:

Understanding Slope (0:12): The slope of an I-V graph (I/V) represents the reciprocal of resistance (1/R). If the slope is negative, the resistance is also negative.
Identifying Slope Direction (1:04):
If the graph goes up as you move right along the x-axis, the slope is positive.
If the graph goes down as you move right along the x-axis, the slope is negative.
Negative Resistance Region (1:39): In the given GaAs graph, the region D to E exhibits a negative slope (the graph goes downwards as voltage increases), indicating negative resistance (2:11).
Ohm's Law Region (2:20): Ohm's Law states that V is proportional to I, meaning resistance is positive and constant. The region B to C on the graph is where Ohm's Law is obeyed, as it shows a positive slope (the graph goes upwards) that is constant (2:48).