x Turn on thread page Beta
 You are Here: Home >< Physics

# AQA Physics PHYA4 - Thursday 11th June 2015 [Exam Discussion Thread] watch

1. (Original post by bwr19)
Haha I've realised this now after making the same mistake on a similar question. Thanks for the help.
Just did some workings

Posted from TSR Mobile

2. Am I right in thinking that if all the charges where positive they would cancel each other out and the potential would become zero

Posted from TSR Mobile
3. (Original post by michaelotty)
Use E=(1/2)CV^2 for capacitors
also P = ΔW/Δt

then you can derive P = ((1/2)CV2)/Δt
so Attachment 424447=3.5x106W=4.5MW
4. (Original post by Sbarron)

You beat me to it!
5. (Original post by gcsestuff)

Am I right in thinking that if all the charges where positive they would cancel each other out and the potential would become zero

Posted from TSR Mobile
No, potential is a scalar sum. If you had 2 negative charges and 2 positive charges opposite each other they would cancel out. In this instance, you have to use Pythagoras to get the distance to the centre. You know the opposite charges on the diagonal edges cancel, so therefore you just have the 2 positive charges to deal with. Find out R and sub this in to the potential equation (V=Q/kr)
6. (Original post by CD223)
Just did some workings

Posted from TSR Mobile
CD223 has just out played me

7. Just found this if it helps? My workings out have my own little codes going on as I don't do maths lol
(Original post by gcsestuff)

Am I right in thinking that if all the charges where positive they would cancel each other out and the potential would become zero

Posted from TSR Mobile
8. (Original post by Kennethm)
CD223 has just out played me
Lol! Not outplayed dw
9. (Original post by EHR223)
No, potential is a scalar sum. If you had 2 negative charges and 2 positive charges opposite each other they would cancel out. In this instance, you have to use Pythagoras to get the distance to the centre. You know the opposite charges on the diagonal edges cancel, so therefore you just have the 2 positive charges to deal with. Find out R and sub this in to the potential equation (V=Q/kr)
Yep
10. (Original post by palaseum9)
Something like this?

Are you sure it's right to say the viol is parallel?? To me it is perpendicular but in the SAME PLANE
11. Oh I see what you mean parallel as in the coil as a whole structure... I would still be tempted just to say when the coil is in the same plane instead but what do I know lol
12. Hi, does anybody know how to solve this?
13. How many past papers is everyone doing tonight?
14. Has anyone got resources for those question that test inverse proportionality. I really don't understand like he ones say force at midpoint is 5N which is force at 0.75m

i know you have to use the inverse square law .. but I strggle, any resource / videos?
15. (Original post by CD223)
How many past papers is everyone doing tonight?
might look through all of them and see if there are any that i think i have no idea!! 6 marker suggestion was SHM right?
16. How do you do 1cii lol, I don't know anything

Posted from TSR Mobile
Attached Images

17. The answer to this is zero?
I still don't understand

Posted from TSR Mobile
18. (Original post by ubisoft)
How do you do 1cii lol, I don't know anything

Posted from TSR Mobile
in a uniform field the electric field strength is the same all over in between the plates so just calculate it using E=V/d

Important thing to remember is in a uniform electric field although the electric field strength is constant all over the electric potential isn't constant.
19. (Original post by Kennethm)
in a uniform field the electric field strength is the same all over in between the plates so just calculate it using E=V/d

Important thing to remember is in a uniform electric field although the electric field strength is constant all over the electric potential isn't constant.
How do you calculate V? is it just the difference of the top and bottom plates?

and what about the distance, is it just the distance between the plates, or half of it because T is in the middle?
20. (Original post by ubisoft)
How do you do 1cii lol, I don't know anything

Posted from TSR Mobile
well T is half way so do 3+1 and divide by 2 =2V then use E=V/d So 2/0.6 = 3.3

TSR Support Team

We have a brilliant team of more than 60 Support Team members looking after discussions on The Student Room, helping to make it a fun, safe and useful place to hang out.

This forum is supported by:
Updated: February 22, 2016
Today on TSR

### Been caught plagiarising...

...for the 2nd time this year

### Mum says she'll curse me if I don't go to uni

Discussions on TSR

• Latest
Poll
Useful resources

Can you help? Study help unanswered threadsStudy Help rules and posting guidelinesLaTex guide for writing equations on TSR

## Groups associated with this forum:

View associated groups
Discussions on TSR

• Latest

The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE