First slide

Ohm's law

Question

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

Moderate

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

Solution

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

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