The resistivity of aluminum is $2.8 \times 10^{-8} \Omega \cdot \mathrm{m}$. How long a piece of aluminum wire $1.0 \mathrm{~mm}$ in diameter is needed to give a resistance of $4.0 \Omega$ ?
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We need to find the length of an aluminum wire that has a resistance of $4.0 \Omega$. We are given the resistivity of aluminum ($2.8 \times 10^{-8} \Omega \cdot \mathrm{m}$) and the diameter of the wire ($1.0 \mathrm{~mm}$). Show more…
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