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ALL CIE PHYSICS DOUBTS HERE !!!

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angel_ak:
 Thankew sir, i understood the method..
but m confused why we are considering the ans only in 1 sf? :s

angel_ak:
and if we consider 1sf the answer should be A ie 9 x 10-3
but the book says ans is D ie 8.8 x 10-3

astarmathsandphysics:
cos the estimates for diameter are 5% apart only take 1 sf

silvercameron:
anyone? Help with the question i already posted ^ pls.

astarmathsandphysics:
R=rh*l/A=rho*l/(pi*r^2) so r=sqrt((rho*l)/(R pi)) so if diameter (and so R) increase by a factor (1.7*10^-8)/(2.6*10^-8) and diamneter of copper=(1.7*10^-8)/(2.6*10^-8)*1.2mm

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