Question

The $V-I$ graph for a wire of copper of length $L$ and cross-section area $A$ is shown in the figure below. 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. Doubled if length of the wire is halved

Answer 1

Answer: (C)

On doubling the length of wire its resistance is doubled and slope of $V-I$ graph is doubled