R = 0.3 ohms
Mass of copper is 1.35 g = 0.00135 kg
Volume = Mass / Density
Density of copper = 8950 kg/m3
Volume = 0.00135/8950 = 1.50837*10-7 m3
Volume of a Cylinder = pi * radius2 * length
length = Volume / (pi * radius2)
............................................... 1
and Crosssectional Area of Cylinder = pi * radius2
R = p * L / A ............................................................... 2
where p is resistivity (p of copper is 1.68*10-8 ohm-m)
Equating value of length in eqn 2 from 1
Resistance = (1.68*10-8 ohm-m)*(V/(pi*r2)) / (pi*r2)
(pi*r2)2 = 1.68*10-8 *1.50837*10-7/0.3 = 0.8446 *10-15
r4 = 8.567*10-16
r = 1.7108 *10-4 m, diameter = 2r = 3.4216*10-4 m = 0.3421 mm
L = 1.50837*10-7/pi* (1.7108 *10-4)2
L = 5.15 m
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