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# Edexcel IAL Physics Unit 3 WPH03 May June 2016 Discussion

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1. (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
2. I think the line has to go through the origin
3. (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
4. (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
5. (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
6. (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 -.-
7. Wait was the answer velocity and not pascals? I was stuck between the two.
8. (Original post by MrBioBombastic)
It was velocity pascals is unit not quantity
Wasn't the question for the S1 derived unit?
9. (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?
10. (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
11. (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.
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 :/
13. (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
14. What did you guys put for the main uncertainty of the refractive index experiment?
My gradient was 5, my resistivity was 1.23*10^-6
My resistivity was 1.11*10^6
16. (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
17. (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?
18. (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
Parallax error for protractor lol
I put in parallax error when placing the pins, is that also correct?
20. (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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