Question

the resistance of a metal wire of length 5 metre is 60 ohm at 20 degree Celsius. if the diameter of the wire is 6 cm what will be the resistivity of the metal at that temperature





please answer it
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Answer 1

Explanation:

$R = p \frac{l}{A } \\ p = \frac{RA}{l} \\ p = \frac{60 \times \pi \times 0.06 \times 0.06}{5 \times 2 \times 2} \\ p = \frac{60 \times 3.14 \times 0.06 \times 0.06}{20} \\ p = \frac{0.67824}{20} \\ p = 0.033912 \: ohm \: metre$