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I-V characteristics of a copper wire of...

`I-V` characteristics of a copper wire of length `L` and area fo cross-section `A` is shown in Fig. The slope of the curve becomes

A

More, if the experiment is performed at higher temperature

B

More, if a wire of steel of same dimension is used

C

More, if the length of the wire is increased

D

Less, if the length of the wire is increased

Text Solution

Verified by Experts

The correct Answer is:
D
Slope of V-I curve `=R = (rho l)/A`
Slope of I-V curve = `1/R = A/(rho l)`
as `I uarr`, slope decreases.
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