I'm confused on how to answer part b. IE ... As a wire is stretched out so that its lengthincreases, its cross-sectional area decreases, while thetotal volume of the wire remains constant. (a) Will theresistance after the stretch be (1) greater than, (2) thesame as, or (3) less than that before the stretch? (b) A1.0-m length of copper wire with a 2.0-mm diameter isstretched out; its length increases by 25% while its cross-sectional area decreases, but remains uniform. Computethe resistance ratio (final to initial).

b) Given: A copper wire, Length of wire, L=1 m Diameter of the wire, d=2 mm=2×10-3 m After…

Answered: same as, or (3) less than that before…

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same as, or (3) less than that before the stretch? (b) A 1.0-m length of copper wire with a 2.0-mm diameter is stretched out; its length increases by 25% while its cross- sectional area decreases, but remains uniform. Compute the resistance ratio (final to initial).