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

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So you tell me why dividing a number you got given, by another value you got given constitutes 2 marks. Contrast this to the previous question where you were asked to multiply 3 numbers together for 1 mark (flux linkage) then asked the units for another mark (wbturns). All the physicists (as in the teachers) in my school agree with the use of the rms value

Probably one mark for working, two for answer with no working and there was a mark for the unit.

Reply 4601

kevincarreira

that Hitler reacts video killed me

Reply 4602

Protoxylic

Original post by StarvingAutist

e = -N dphi(t)/dt
therefore Sa,b(e)dt = [Nphi(t)]a,b
No negative because of sin and cos blah blah blah

It should definitely be an integral; time is continuous.

I just realised that the 2nd mark was for the unit, **** me. Why must I get confused over the number of marks rather than thinking through the physics. Oh well, that's the only question I fudged up, rest went good. And you?

Reply 4603

Protoxylic

Original post by NEWT0N

Nice! Did you halve the electrons in the MC?

Nope. The Q in Q=CV is the charge accumulated (or the magnitude) on one of the plates, not both.

Reply 4604

Razzamataz179

How many marks was the work done question, the electric field question, and the E.M.F question and what were the answers to these?

Reply 4605

bthmandem

Original post by Cmog

http://www.sunnyskyz.com/happy-pictures/108/Sloth-carrying-her-baby

^unofficial mark scheme

i actually clicked it -.-

Reply 4606

danphil

On the multiple choice section, what was the right answer for the number of electrons? I didn't have Scooby Doo so I just guessed it.

Reply 4607

Sonnyjimisgod

I think the boundaries will be:
A*=60
A=55
B=50
C=45
Dont quote me on results day

Reply 4608

danphil

Original post by kevincarreira

that Hitler reacts video killed me

Is there one for this exam? Could you send me the link to it if so. Sorry if it's already on here I couldn't see it

Reply 4609

StarvingAutist

Original post by Protoxylic

Well at least you got the unit :tongue:

I think it went well; I might have lost a few marks on MC, 1a and the last question but otherwise I'm pretty confident.
I'm not too sure about unit 5 though. We'll see. Good luck :smile:

Reply 4610

kevincarreira

Original post by danphil

Is there one for this exam? Could you send me the link to it if so. Sorry if it's already on here I couldn't see it

https://www.youtube.com/watch?v=_l1XCc4xlws

Reply 4611

Sonnyjimisgod

Original post by NEWT0N

Are any of these accepted?
(Somehow I completely forgot to cross it out properly and ended up scribbling it out -- in pen.)

It clearly said at the front put a cross, are teacher said last year one student did what you did and lost 5 marks even though they wew all right. Maybe after a renark by human eye they could go up but i reckon by computer marking maybe not. Im sorry but we got told this on our last lesson just to make sure we didnt loose any silly marks

Reply 4612

djw0bbl3

Original post by NEWT0N

I'm afraid the most one can say is that the grade boundaries MIGHT be lower because the written was harder than last year's (I thought last year's written was really standard with the capacitors 6 marker and all).

But if e.g. you need an A for your offer and you dropped 45 marks there's no reassurance there really, just work harder next time

Oh no no noo I haven't dropped 45 haha just didn't go too welll

Reply 4613

danphil

Original post by kevincarreira

https://www.youtube.com/watch?v=_l1XCc4xlws

Thanks

Reply 4614

Fvthoms

Original post by StarvingAutist

Well, what is wrong with my working? Nothing as far as I can see.

Can you post the values provided in the question that you remember? Wanted to check workings, but calculator cleared itself.

Reply 4615

Protoxylic

Original post by StarvingAutist

Well at least you got the unit :tongue:

I think it went well; I might have lost a few marks on MC, 1a and the last question but otherwise I'm pretty confident.
I'm not too sure about unit 5 though. We'll see. Good luck :smile:

I think I'm on for full marks with MC, with the only exception being the last Q on MC I said it was to increase mechanical stability. MC was fairly standard, 2-3 repeated Qs. Long answer was pretty good (bar the emf 2 marker oops). 1a was weird since you couldn't mention specific phase differences for forced vibrations as it is a range from 0 to pi/2 and pi/2 to pi (not inclusive of pi/2 as that is resonance). So I'm interested to see the mark distribution for that. Unit 5 is alright, I just hate turning points so we will see how that goes. Thanks, you too :tongue:

(edited 8 years ago)

Reply 4616

JayCS

Can anyone remember if the question with the iron rod used a DC or AC current? Was it implied? I can't remember at all.