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goWlfpack
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Homework Statement
A wire, 50.0 m long and 2.00 mm in diameter is connected to a source with a potential difference of 9.11 V, and the current is found to be 23.45 A. Assume a temperature of 20°C and using Table 17.1, identify the metal out of which the wire is made of.
Homework Equations
R=p(l/A)
where R is the resistance p is the coefficient of resistivity, l is the length and A is the area
The Attempt at a Solution
ok since we are solving for p first i found R by the equation V=IR and found R to be .388
next i found the area using the surface area of a cylinder and found that to be .628
next i divided length by .628 and found that to be 79.618
so then i divided .388/79.618 and got 4.8*10^-3
thats the right magnitude but it does match any of my options coefficients.
the problem let's me choose whether the metal is gold, silver, copper, or iron.