Question

Resistance of a metal wire of length 2m is 30 ohms at temperature 25°C, if diameter of the
wire is 0.6mm, then what will be the resistivity of the metal at that temperature?
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Answer 1

Answer:

0.0000169646003316 ohm m

Explanation:

$Resistivity(R) = \frac{Resistivity * Length(l)}{Cross Sectional Area(A)}$

$Resistivity = \frac{Resistance(R) * \pi * Radius(r)^{2}}{Length(l)} = \frac{30ohm * \pi * (0.0006m)^{2} }{2m} = 0.0000169646003316 ohm m$