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Edexcel unit 2 physics help!!!!

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Igcseboy:
Question 21 c (ii)

june 2009 unit 2

helpp urgentsss

astarmathsandphysics:
R=pl/A and V=lA so A=V/l
R=(pl/(V/l))=pl*l/V=pl^2/V
increase in resistance=9.9*10^-6*((8*0.251)^2-(8*0.025)^2)/(9*10^-8*8*2.5*10-6)
or just work out final and initial restance and subtract

Igcseboy:
thanks

another please question 19 b Jan 2010

astarmathsandphysics:
Which paper?

astarmathsandphysics:
this?

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