AI-generated practice question — model-generated for extra practice, not a previous-year CBSE board question.
(B) Ohm's law
The V–I graph being a straight line through the origin shows that V ∝ I at constant temperature, which is the graphical representation of Ohm's law.
Source: Chapter 11, Section 11.4 Ohm's Law
Ohm's law states that potential difference (V) across a metallic conductor is directly proportional to the current (I) through it, provided temperature remains constant. A straight-line V–I graph passing through the origin is the standard graphical proof of this law, as described in Activity 11.1 and Fig. 11.3 of the textbook. Joule's law relates heat to current; Kirchhoff's and Faraday's laws are unrelated to this graph.