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Question

What is the shape of the graph between V and I, where V is the potential difference applied between the ends of a wire and I is the current flowing through it ?

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Solution

If a graph is drawn between the potential difference (V) and current (I), the graph is found to be a straight line passing through the origin. This shows that the current is directly proportional to the potential difference.
Calculating the slope of the graph, VI = 0.40.1 = 4 = R
Thus, the ratio VI remains constant. The slope of the V-I diagram gives the resistance(R) of the conductor.

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