Three $V -I$ graphs are drawn individually for two resistors and their series combination. Out of $A, B,C$ which one represents the graph for series combination of the other two. Give reason for your answer.

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We know that in series combination, resultant resistance is always greater than the individual resistances. In the given graph, $C$ is shown maximum resistance (as slope of $V-I$ graph gives resistance), thus, $C$ represents the resultant series combination of the other two.

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