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# OCR Physics B G495 Field and Particle Pictures June 21st 2011 Exam Thread watch

1. (Original post by jfrudd92)
panicking now... anyone able to give me a quick overview of everything lol?
Read the entire thread, that will definitely help, I think.
2. One more past paper, then I'm ready.
Anyone have a link to Jun 09? dont think I have that one.
3. (Original post by Summerdays)
This isn't necessary. Remember that energy and mass (matter) are interchangeable.
I thought when energy is converted to mass you have to make equal amounts of matter and antimatter... isn't that the whole idea behind pair production?
4. I'm not ready - but oh well!
5. You stole my thread's thunder -forever alone-

But yeah, I am so unbelievably doomed for this exam! I detest the synoptic questions. I agree with the person who said they hope they're mostly show-that questions.

Often it seems that the easiest Advance Notices throw up the hardest questions, and sometimes horrible-looking articles give nice calculation and data-handling type questions, so I'm hoping that's going to happen, as I greatly dislike the topics of the article this year.
6. (Original post by Alex.Stevens)
I thought when energy is converted to mass you have to make equal amounts of matter and antimatter... isn't that the whole idea behind pair production?
But that's only to conserve charge, momentum and baryon number. But in general, this isn't the case - and that's what I am trying to make clear. You might find that the mark scheme wouldn't accept your answer because the underlining reason - because that isn't always the case.
7. (Original post by Ollie901)
One more past paper, then I'm ready.
Anyone have a link to Jun 09? dont think I have that one.
http://www.johnbright.conwy.sch.uk/d...64June2009.pdf Here you are
8. Still finding that emf = -dnphi/dt thing hard
like, im given a graph
and it just says calculate the amplitude of the emf across the coil

but its a curve, (of which i have no equation) hence differentiating to find gradient at a certain point is hard .. sorry if im being stupid haha

do i approximate gradient by drawing a tangent?
9. (Original post by Geekchic17)
Still finding that emf = -dnphi/dt thing hard
like, im given a graph
and it just says calculate the amplitude of the emf across the coil

but its a curve, (of which i have no equation) hence differentiating to find gradient at a certain point is hard .. sorry if im being stupid haha

do i approximate gradient by drawing a tangent?
Basically, yes.
10. (Original post by Summerdays)
Basically, yes.
aha okay .. just doesn't seem particularly accurate..
11. I am NOT READY.

Ah well, who needs sleep.
12. (Original post by Swindan)
I am NOT READY.

Ah well, who needs sleep.
Ask me more random questions for the time being (Section A to C.)
13. (Original post by Geekchic17)
Still finding that emf = -dnphi/dt thing hard
like, im given a graph
and it just says calculate the amplitude of the emf across the coil

but its a curve, (of which i have no equation) hence differentiating to find gradient at a certain point is hard .. sorry if im being stupid haha

do i approximate gradient by drawing a tangent?
EMF = rate of change of flux linkage, so when rate of change of flux linkage is greatest, i.e. the gradient of the graph is greatest, the EMF will be greatest.
14. Who writes Sections A-C, and where can I find them?

Cheers
15. (Original post by macleod.mac)
EMF = rate of change of flux linkage, so when rate of change of flux linkage is greatest, i.e. the gradient of the graph is greatest, the EMF will be greatest.
The initial gradient of the graph, right?
16. (Original post by Swindan)
Who writes Sections A-C, and where can I find them?

Cheers
Haha, what do you want to do to them?
17. (Original post by Geekchic17)
aha okay .. just doesn't seem particularly accurate..
It's not...But as long as you don't make a right hash of it, it's basically free marks
18. (Original post by Summerdays)
Ask me more random questions for the time being (Section A to C.)
Btw . what's mean by spherical/point charge? n I'm still a bit confused of the flux density stuff~ why the curves are always sine curve and +- phi/2 phase?
19. This is going to be a bad week...

Had c4 today, I should have called 999 as I basically got raped....
And then phys tomorrow, wow... How unlucky is it for some one to get raped twice in 2 days..well hopefully the phys one will be wearing a condom...

I mean it can't be any worse than c4.... I pretty much got aids/HIV from it

Bye bye university, grrr
20. I have a question as well in a transformer if the current is varying sinusoidally and the question asks you to sketch a graph of flux and then emf I understand that the e.m.f is simply the differential of the flux graph but should the flux graph be in phase with the current graph or inverted or what? The mark schemes I've found are never particularly clear on this one

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