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P1 CIE physics doubts

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Saladin:
can sum1 please give me the paper, maybe i can help.

~ A.F ~:
R= pl/A

it says both wires have the exact volume..i.e the exact area and length x

These are the only factors on which the resistance depends on..

and so both have equal resistances

sweetie:
here is the paper
thanx A.F

Saladin:
I hate to disagree with you A.F, but even though the markscheme says C, I am not entirely convinced that that is the answer. I think we need astar to explain.

~ A.F ~:
Here's ur explanation guys:

Resistance of P= pl/A...agree?

Resistance of Q:

Area of each wire of the seveen wires= A/7...right?

now R=pl/A= pl/(A/7)= 7pl/A...so far so good..thats the are for each wire..

now total area of resistor Q:

RT = (1/R1 + 1/R2 ....)-1

=(1/(7pl/A) x7)-1 = pl/A

hope that's clear now

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