Physics-
General
Easy

Question

I minus Vcharacteristic of a copper wire of length L and area of cross-section A is shown in figure. The slope of the curve becomes

  1. More if the experiment is performed at higher temperature    
  2. More if a wire of steel of same dimension is used    
  3. More if the length of the wire increased    
  4. Less if the length of the wire increased    

The correct answer is: More if the experiment is performed at higher temperature


    Slope of graph
    equals fraction numerator I over denominator V end fraction equals fraction numerator 1 over denominator R end fraction
    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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