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KCET2020PhysicsCurrent Electricity

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

Options

  1. AMore if experiment is performed at higher temperature
  2. BMore if a wire of steel of same dimension is used
  3. CLess if the area of the wire is increased
  4. DLess if the length of the wire is increased

Correct answer

D. Less if the length of the wire is increased

Step-by-step solution

I-V characteristics of copper wire of length L and area of cross-section A is shown in the figure. Since, I-V characteristic is a straight line, hence it obeys Ohm ^ s law. According to which resistance of copper wire, aligned R &= V I = R &= l A &= aligned or ( A l ) Hence, slope ( ) of the curve becomes (i) less if the length of the wire is increased. (ii) more if the area of the wire is increased. (iii) less if a wire of steel of same dimensions is used as _ steel > _ copper . (iv) less if experiment is performe

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