$I-V$ characteristic of a copper wire of length $L$ and area of cross-section $A$  is shown in figure. The slope of the curve becomes
  • A
    More if the experiment is performed at higher temperature
  • B
    More if a wire of steel of same dimension is used
  • C
    More if the length of the wire is increased
  • D
    Less if the length of the wire is increased
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