A , B and C are three wires have same length but different diameters Which of the following true ?

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A , B and C are three copper wires have the same length but different in diameters (DA , DB ancl Dc respectively) at certain temperature with resistances RِA , RB and Rc respectively. The opposite graph shows the relation between the current passing through each wire and the potential difference across its terminals. Which of the following is true ?
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