A $120 - \mathrm { m }$ long metal wire having a resistivity of $1.68 \times 10 ^ { - 8 } \Omega \cdot \mathrm { m }$ has a resistance of $6.0 \Omega$. What is the diameter of the wire?

Question

Quizplus · Accepted Answer

Using the formula for resistance $ R = \rho \frac{L}{A} $, where $ A = \pi \left(\frac{d}{2}\right)^2 $, solve for diameter $ d $. The correct diameter is $0.65 \mathrm {~mm}$.

A 120−m120 - \mathrm { m }120−m Long Metal Wire Having a Resistivity Of

A $120 - \mathrm { m }$ Long Metal Wire Having a Resistivity Of