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Physics
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 becomes
KCET
KCET 2020
Current Electricity
A
More if experiment is performed at higher temperature
24%
B
More if a wire of steel of same dimension is used
13%
C
Less if the area of the wire is increased
19%
D
Less if the length of the wire is increased
44%
Solution:
Slope $=1 / R = A / \rho l$
Hence the slope becomes less if the length of the wire is increased.