There are two conductors. Which of them has more resistance if they: a) have the same length and cross-sectional area, but one of them is made of constantan, and the other is made of fechral; b) made of the same substance, have the same thickness, but one of them is 2 times longer than the other; c) are made of the same substance, have the same length, but one of them is 2 times thinner than the other?
a) From fechral; b) longer; c) more subtle.
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