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# Edexcel IAL Physics Unit 3 WPH03 May June 2016 Discussion

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Why bother with a post grad? Are they even worth it? Have your say! 26-10-2016
1. (Original post by ToxicPhantom007)
Hi everybody !!
How did your exam go ?
Mine went really well unlike chem u3 :V
What was your value for resistivity ?
(something)x10^-6
2. (Original post by mira99)
who's taking bio chem phy and math ??
i take all of them except bio
3. (Original post by OnTheHorizon)
Sadly I don't think so as most of the people wrote between 4.5 and 5 for gradient even below 4.5 I'm not sure but I don't think 5.7 is gonna cut it.For resistivity you might get method marks but the answer was 1.xx*10^-6 not anymore than a 1.
What was the diameter of the wire from which we had to calculate the area.
if u remember tell the diameter.
4. can we keep current constant by keepin cross sectional area of wire constant as
I =nqva
isnt da purpse of da variable resistor is to vary current btw???
5. can we tell resistivity value differs because of contact resistance between connecting wires is not taken into calculation?
6. (Original post by Ahmed3651998)
What was the diameter of the wire from which we had to calculate the area.
if u remember tell the diameter.
I think it was 0.56 or 0.056*10^-3
7. what did you guys answer for the question about how to keep current constant? I wrote use a variable resistor.
8. is it bad that I gave more than one answer for the last question; about why the results may be inaccurate??
9. Hey guys what did you write for the last question?
10. To determine refractive index i said use equation u=Sini/Sin r.
I didnt mention about Plotting a Sin i against Sin r graph, and gradient = refractive index.
So how many marks do i loose?
11. (Original post by Ayaaazzz)
what did you guys answer for the question about how to keep current constant? I wrote use a variable resistor.
Yeah I wrote pretty much the same thing using a potentiometer...
12. (Original post by ToxicPhantom007)
Umm.. with this way you could just read off the current and you won't MAKE it constant ryt ? What if the ammeter reading isn't constant :V
I wrote that use a variable resistor
But doesn't a variable resistor also alter the current in the circuit?
13. (Original post by methrian)
Hey guys what did you write for the last question?
I mentioned that the wire may have gotten hotter which will affect the resistance of the wire therefore, this would have given a slightly different value (even if the calculations are correct).
14. (Original post by userk 12)
is it bad that I gave more than one answer for the last question; about why the results may be inaccurate??
I don't think so, it depends on the number of marks. How many marks was that question worth?
15. (Original post by don't cry-craft)
I mentioned that the wire may have gotten hotter which will affect the resistance of the wire therefore, this would have given a slightly different value (even if the calculations are correct).
I wrote the current wont be constant
16. (Original post by don't cry-craft)
I don't think so, it depends on the number of marks. How many marks was that question worth?
it was one mark but thanks
17. (Original post by ToxicPhantom007)
Hi everybody !!
How did your exam go ?
Mine went really well unlike chem u3 :V
What was your value for resistivity ?
Mine was 1.21x10*-6
18. (Original post by Ayaaazzz)
what did you guys answer for the question about how to keep current constant? I wrote use a variable resistor.
same
19. i put thick lines, or ambient light
20. guys, for the comment on safety, i put relatively safe experiment/ low risk experiment
and i got the vernier caliper question wrong, i put C
question 7 was actually nice, it was a delightful change
but there was a comment on whether repeat readings are appropriate or not, i wrote they are unless lamp gets hot, is that right?
also there was list additional apparatus, i wrote protractor and pins
also Last question, the resistivity was 1.11 x 10^-6, but i wrote it only to 2 SF, is that fine?

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