Resistance:

$\overline{){\mathbf{R}}{\mathbf{=}}{\mathbf{\rho}}\frac{\mathbf{l}}{\mathbf{A}}}$ where ρ is the resistivity, l is the length, and A is the cross-sectional area.

If you stretch a copper wire so that it becomes thinner and longer, the resistance between its ends becomes

a. larger

b. smaller

c. The resistance remains unchanged

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