Note: plz review the value of resistivity of copper.
a)
resistance
R = rho * L / (pi /4 d^2)
current
i = V/r = V ( pi/4 d^2) / ( rho * L)
i = 12* (3.14/4* (0.1* 10^-2)^2 / ( 68* 10^-8* 0.1)
i = 138.529 A
=======
b)
i = 12* 3.14/4* ( 0.05* 10^-2)^2 / ( 68* 10^-8* 0.1)
i = 34.632 A
=====
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