Question

The current- voltage graph for a given metallic wire at two different temperatures t) and ${{T}_{1}}$ and ${{T}_{2}}$ is shown in the figure. The temperatures ${{T}_{1}}$ and ${{T}_{2}}$ are related as

• A. ${{T}_{1}}>{{T}_{2}}$
• B. $ {{T}_{1}}
• C. ${{T}_{1}}={{T}_{2}}$
• D. ${{T}_{1}}>2{{T}_{2}}$

Answer 1

Answer: (B)

$ {{T}_{1}}

Answer 2

Slope of the V - i curve at any point is equal to resistance at that point From the curve slope for ${{T}_{1}}>$ slope for ${{T}_{2}}$ ${{R}_{{{T}_{1}}}}{{T}_{1}}$