R = rho*L/A
rho = restivity of copper = 1.68 x 10^-8 ohm-m
L = lenght
A = area
part a)
A = pi*r^2
r = 0.15 mm = 0.15 x 10^-3 m
L = 1.5 m
R = 0.3565 ohm
part b )
L = 10 cm = 0.1 m
A = 1.5 x 10^-3 * 1.5 x 10^-3
R = 7.5 x 10^-4 ohm
part 1 )
R = rho*L/A
now L' = 2L
r' = 2r
R' = rho*L'/pi*r'^2
R' = rho*2L/pi*4r^2
R' = R/2
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