Question #b8ad5

1 Answer
Akshay W.
Apr 20, 2017

0.2377 #Omega#

Explanation:

To find the resistance of a copper wire with given parameters we use
#R=(rho*l)/A#
#(1.68*10^(-8)*25)/(3.14*5.627*10^(-7))=0.2377Omega#

According to your confusion ..
we got diameter=1.5mm which is equal to #0.0015 m#
but in scientific notion we write it #1.5*10^(-3)m#
Dividing it by 2 we get ..
#0.75*10^(-3)m=7.5*10^(-4)m#

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