Physics-
General
Easy
Question
characteristic of a copper wire of length 
and area of cross-section 
is shown in figure. The slope of the curve becomes
- More if the experiment is performed at higher temperature
- More if a wire of steel of same dimension is used
- More if the length of the wire increased
- Less if the length of the wire increased
The correct answer is: More if the experiment is performed at higher temperature
Slope of graph
If experiment is performed at higher temperature then resistance increase and hence slope decrease, choice (a) is wrong.
Similarly in choice (b) and (c) resistance increase.
But for choice (d) resistance R increases, so slope decreases
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