Question: Given a copper wire of length (100 mathrm{~cm}), radius (0.8 mathrm{~mm}), and resistivity (1.68 times 10^{-8} Omega cdot mathrm{m}), find its resistance and current through

Given a copper wire of length $100 \mathrm{~cm}$, radius $0.8 \mathrm{~mm}$, and resistivity $1.68 \times 10^{-8} \Omega \cdot \mathrm{m}$, find its resistance and current through the wire if connected to a $20.0-\mathrm{V}$ battery. If the wire is stretched uniformly to 4 times its original length, what will be its new resistance?

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