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Edexcel IAL Physics Unit 3 WPH03 May June 2016 Discussion Watch

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    (Original post by Blazyy)
    Alright I got gradient as 4.54 recurring, rounded off to 4.55. My resistivity value was 1.12x10^-6. Do you think my answer fits within the range of possible values?
    Also, my graph didn't go through the origin, will I lose a mark?
    My gradient was 4.6 something and resistivity was 1.14 x 10^-6
    No it's a best fit line and it's not compulsory that it would go through origin. So I think you're fine there
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    I think the line has to go through the origin
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    (Original post by tejsanghavi)
    did anyone get their gradient as 4.5?
    I made a major error.... i used the diameter on its own as area. how much do you guys think ill get out of 4?
    For keeping current constant i mentioned using a power pack set at 0.11A. Any chance its correct?
    You should've divided the diametre by 2 and then take the square of it and multiply with pi. I reckon you will lose 2 marks there
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    (Original post by iWant.A)
    I think the line has to go through the origin
    I didnt start the x axis from 0 so I'm not sure :P
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    (Original post by ToxicPhantom007)
    I didnt start the x axis from 0 so I'm not sure :P
    Since it is resistance against lenght, i think that if the length=0 then resistance of wire must be zero as well since there is no wire
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    (Original post by iWant.A)
    Since it is resistance against lenght, i think that if the length=0 then resistance of wire must be zero as well since there is no wire
    Ditto. I thought of the same thing, sadly I got confused and rubbed out the line extending to the origin -.-
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    Wait was the answer velocity and not pascals? I was stuck between the two.
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    (Original post by MrBioBombastic)
    It was velocity pascals is unit not quantity
    Wasn't the question for the S1 derived unit?
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    (Original post by don't cry-craft)
    Wasn't the question for the S1 derived unit?
    No, the question was derived quantity.

    Also i got the gradient as 5 exactly, anyone else? and i used R=PL/A for resistivity, is that correct?
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    (Original post by don't cry-craft)
    Wasn't the question for the S1 derived unit?
    Mate they wanted quantity not a unit, Pascal is a unit, Velocity is quantity
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    (Original post by Ali Bizri)
    No, the question was derived quantity.

    Also i got the gradient as 5 exactly, anyone else? and i used R=PL/A for resistivity, is that correct?
    Yes I used that equation, and my gradient was like 4.5... something, so close enough.
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    (Original post by Hamadtype-)
    Mate they wanted quantity not a unit, Pascal is a unit, Velocity is quantity
    Oh no! I put velocity at first but then I thought they wanted the unit and I changed my answer in the last minute :/
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    (Original post by don't cry-craft)
    Yes I used that equation, and my gradient was like 4.5... something, so close enough.
    My gradient was 5, my resistivity was 1.23*10^-6
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    What did you guys put for the main uncertainty of the refractive index experiment?
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    (Original post by Hamadtype-)
    My gradient was 5, my resistivity was 1.23*10^-6
    My resistivity was 1.11*10^6
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    (Original post by don't cry-craft)
    What did you guys put for the main uncertainty of the refractive index experiment?
    Parallax error for protractor lol
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    (Original post by don't cry-craft)
    Yes I used that equation, and my gradient was like 4.5... something, so close enough.
    don't we use the graph to find the gradient?
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    (Original post by Ali Bizri)
    No, the question was derived quantity.

    Also i got the gradient as 5 exactly, anyone else? and i used R=PL/A for resistivity, is that correct?
    Yeah then rearrange, P=RA/L , R/L is 5 so 5 x A Gives resistivity
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    (Original post by Hamadtype-)
    Parallax error for protractor lol
    I put in parallax error when placing the pins, is that also correct?
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    (Original post by Sunethra)
    don't we use the graph to find the gradient?
    Yeah, But the second and third point was out of the best fit line
 
 
 
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