The specific resistance of the material of a wire is 44 * 10^-8 ohm m. if the resistance of the wire is 14 ohm and it's diameter is 1mm, calculate the length of wire .
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Given :
resistivity of the conductor = 44 * 10^-8 ohm m.
R = 14 ohm
Diameter = 1mm
Area = πD^2/4 = π/4 * (10^-3)^2 m^2
we know that,
length of wire = resistance * area/ resistivity of the conductor
=. 14 * π/4 * (10^-6)* 1/44*10^-8
= 14 * (22/7*4 )* 10^-6 *1/44*10^-8
= 14 * 22/28 * 100/44
= 22/2 * 100/44
= 100/4
= 25m
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Answer:
24 metre is the right answer of this question