Resistance of a metal wire of length 17 is 26 ohm if the diameter of wire is 0.30.3mm what will be the resistivity of the metal at that temperature?
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formula for finding resistivity of a metal wire is given as
R= r (l÷A)
where R is given resistance of the wire
r is resistivity
l is length of the wire
A is area of cross section(pie × (radius)^2)
as given in the question
R = 26 ohm
r=?
l= 17cm
A = pie×(0.15cm)^2
=0.314 × 0.225
=0.071cm^2
putting in the formula
(26 × 0.071)÷ 17 =r
r = 0.11 ohm cm
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