A wire of length 3 m , area of cross-section 1.7 × 10-6 m
2
has a resistance 3 × 10-2
ohm.
a. What is the formula for resistivity of the wire and what is the unit of it
b. Calculate the resistivity of the wire
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Explanation:
Formula of resistivity-
Resistivity = (Resistance× Cross section Area)/Length
unit of resistivity-ohm-meter
b) Length= 3m
cross sectional area = 1.7×10^-6 m^2
resistance = 3×10^-2 ohm
resistivity = (Resistance× Cross section Area)/Length
= (3×10^-2 × 1.7×10^-6)/3
=1.7×10^-8 ohm-meter.
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