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Resistance

Could someone please explain how to do this question?
(edited 2 years ago)
you want to find the resistivity from the information in the first 2 sentances using: resistivity=(resistance x area)/length (make sure to convert to meters first)
then rearrange the equation to get: Resistance= (resistivity x length)/ area, use the saem resisitivyty you just calculated before, then for one of them you should get 0.15Ohm. lmk if that didnt make sense, also this exquation is in the A-level formual booklet (well it is aqa at least)
hope that helped
https://isaacphysics.org/concepts/cp_resistivity?stage=all

Remember that the cross sectional area of a wire is pi*r^2

And that r (radius) is half the diameter
Original post by S0303
Could someone please explain how to do this question?

The important point to note is that resistivity is a feature of the material. So, two pieces of the same wire have the same resistivity. Then, as @MayaZamir8 says, use the equation to answer the question.
(edited 2 years ago)

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