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  4. 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

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Q. $I-V$ characteristic of a copper wire of length $L$ and area of cross-section $A$ is shown in figure. The slope of the curve becomesPhysics Question Image

KCETKCET 2020

Solution:

Slope $=1 / R = A / \rho l$
Hence the slope becomes less if the length of the wire is increased.