Why, in the experiments described at the beginning of the previous page, were first measured the resistances of wires of different lengths

Why, in the experiments described at the beginning of the previous page, were first measured the resistances of wires of different lengths, but the same cross-section, and then – the resistances of wires of different cross-sections, but the same length?

To determine the dependence of one physical quantity on another, it is necessary that all the other physical quantities remain unchanged during the setting up of the experiment.

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