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A copper wire of length L and cross sectional Area A is used and the corresponding current Vs voltage graph is drawn as shown.The slope of the curve becomes

$(a)\; \text{more if experiment is performed at level temperature} \\(b)\;\text{more if length of wire is increased }\\(c)\;\text {less if length of wire is increased }\\(d)\; \text{none of the above } $

1 Answer

The slope of the graph represents $\large \frac{I}{V}=\frac{I}{R}$
As length of wire increases the resistance of wire increases and so slope of the curve decreases .
Hence c is the correct answer.
answered Mar 18, 2014 by meena.p

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