Q.
The $V - I$ graph for a wire of copper of length $L$ and cross-section ares $A$ is shown in adjoining figure. The slope of the graph will be
A) Less if the experiment is repeated at a higher temperature
B) More if a wire of silver having the same dimension is used
C) Doubled if the length of the wire is doubled
D) Halved if length of the wire is halved
Explanation
(c) On doubling the length of wire its resistance is doubled and slope of $V - I$ graph is doubled
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.