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# AQA Physics PHYA4 - 20th June 2016 [Exam Discussion Thread] watch

1. The mean percentage mark on Section A by year:
Jun15-66.8%
Jun14-66.8%
Jun13-60.4%
Jan13-66.0%
Jun12-63.2%
Jan12-68.0%
Jun11-58.0%
Jan11-63.0%
Jun10-59.0%
Jan10-64.0%

Just goes to show how important past papers are maybe, as there is no way Jun10 was harder than Jun15
2. Can someone help with 2bii and 2biii in http://theallpapers.com/papers/AQA/A...W-QP-JUN03.pdf please?
3. Also can someone help with http://theallpapers.com/papers/AQA/A...W-QP-JUN04.pdf 2bii please?
4. (Original post by Lili1998)
Also can someone help with http://theallpapers.com/papers/AQA/A...W-QP-JUN04.pdf 2bii please?
Are there any mark schemes to those papers?
5. (Original post by MintyMilk)
My thought process went like this:

>imagine P and one of the charges as its own system to simplify things initially
>consider the potential at P in this simplified system and what that value would physically represent: a charge differential that causes a force
>now imagine what would happen if another one of those charges were added to the system
>it would double the quantity of stuff acting on P

I didn't do any calculations, but it was clear based on the numbers that 180 was there to represent one charge's potential, and 360 to represent 2 charge's worth of potential, so I guessed 360

As far as what you're saying about forces cancelling goes, I think that would represent the physical, resultant movement of P rather than having an effect on the raw potential the individual charges produce, maybe.
does it mean because this is asking for the electric potential, you just add the total of the Vs?
and if it's asking you for the electric field, it will cancel out?
also if you're asked to find the electric field, do you have to take components?
very confused
6. Hi Again,

I did post before about emailing out question packs

I just have my D1 exam this afternoon so will be emailing as soon as I finish that.

Sorry for the wait, and thanks to everyone who has taken an interest in this !

Cheers,

Will
7. For anyone wanting the Unit 4 papers

Please inbox me your email or email : [email protected] and I can email you back the papers

I am sending out the papers now to the people who have in-boxed me already requesting such.

Enjoy!!

Will
8. (Original post by blueberry389)
does it mean because this is asking for the electric potential, you just add the total of the Vs?
and if it's asking you for the electric field, it will cancel out?
also if you're asked to find the electric field, do you have to take components?
very confused
I found a similar question in an earlier paper that effectively showed two positive charges equidistant from one another creating a resultant positive in the middle. From this I think we can assume that this is how we should go about considering potential in general, i.e. positive charges simply don't cancel.

In the context of the triangle question, I guess this means that both the horizontal and vertical components of each force contribute to the total potential (whatever that physically represents) at the point P, so it must not be necessary to take components

https://youtu.be/GfiYLCoxicE?t=13m8s
9. anyone think a certain 6 marker is more likely?
10. (Original post by thestarter)
anyone think a certain 6 marker is more likely?
I reckon it will be on emf/magnetic fields
I resat both unit 1 and unit 2 which were pretty difficult exams this time round so i reckon they will choose a harder topic such as that

Therefore I reckon a six marker on capacitors is out of the question no matter how much how I would love it to be on that
11. Probably something on transformers or magnetic fields, they've said in a number of examiners reports that students struggle on these topics, it wouldn't surprise me if they ended the last paper of the spec with a bang.

Looking forward to it
12. (Original post by rory58824)
Probably something on transformers or magnetic fields, they've said in a number of examiners reports that students struggle on these topics, it wouldn't surprise me if they ended the last paper of the spec with a bang.

Looking forward to it
There have already been two 6 markers on transformers IIRC - one on how to reduce power loss and the other on how they're used to transmit power across the national grid.

I reckon it will be on a practical to do with capacitors
13. (Original post by TajwarC)
There have already been two 6 markers on transformers IIRC - one on how to reduce power loss and the other on how they're used to transmit power across the national grid.

I reckon it will be on a practical to do with capacitors
That would be lovely!!!
14. (Original post by rory58824)
That would be lovely!!!
Indeed, similar to the 6 markers from unit 1
15. Hi all,

I have been messaging people via email and stuff with papers I have created myself

here is a unit 4 section B style paper and I have created a MS to go with it.

Enjoy !!

Will
Attached Files
16. AQA Style A2 physics past paper 1.doc (25.0 KB, 94 views)
17. AQA Style A2 physics past paper 1- Mark scheme.doc (51.0 KB, 81 views)
18. In which case do we need to use flemings right hand rule? Is it when it's the motor effect?
19. http://filestore.aqa.org.uk/subjects...W-QP-JUN10.PDF

4a i really hate magnetic fields i honestly dont get how its -z i keep getting +z with force inwards and second finger the direction of electron
20. (Original post by liverpool2044)
http://filestore.aqa.org.uk/subjects...W-QP-JUN10.PDF

4a i really hate magnetic fields i honestly dont get how its -z i keep getting +z with force inwards and second finger the direction of electron
Force is to the middle as it's a centripetal force because it's moving in a circle, the electron has a negative charge so you have to treat it as a positive charge going anti-clockwise.

Edit: I should have said positive charge in the +y direction to make it clearer, but that's the overall idea .
21. (Original post by particlestudent)
Force is to the middle as it's a centripetal force because it's moving in a circle, the electron has a negative charge so you have to treat it as a positive charge going anti-clockwise.

Edit: I should have said positive charge in the +y direction to make it clearer, but that's the overall idea .
ah okay so negatives travel in opposite direction to the positive? is this similar in electric fields?

which travel with the force and opposite the field
22. (Original post by liverpool2044)
ah okay so negatives travel in opposite direction to the positive? is this similar in electric fields?

which travel with the force and opposite the field
Yes, a negative charge moving to the right for example has to be treated as a positive charge moving to the left.

Electric field lines show you the direction a positive charge would move if it was placed in that field.

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