I-V characteristics of a copper wire of length L and area of cross-sec

1.	I-V characteristics 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 is increased (4) Less if the length of the wire is increased
Answer» Correct option (4) Less if the length of the wire is increased Explanation: Slope of V-i curve =R(=ρl/A). But in given curve axis of i and V are interchanged. So slope of given curve =1/R(=A/ρl) i.e. with the increase in length of the wire. Slope of the curve will decrease.

I-V characteristics 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 is increased (4) Less if the length of the wire is increased

Answer»

Correct option (4) Less if the length of the wire is increased

Explanation:

Slope of V-i curve =R(=ρl/A). But in given curve axis of i and V are interchanged. So slope of given curve =1/R(=A/ρl) i.e. with the increase in length of the wire. Slope of the curve will decrease.

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