# AQA PHYA4 ~ 13th June 2013 ~ A2 PhysicsWatch

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6 years ago
#781
(Original post by The H)
Yeah, i got that except I think i used 3 sig figs in the time
Would sig figs matter in this case?
0
6 years ago
#782
(Original post by Stellios)
This means a mark of 65/72 = 100 ums?
not sure, heres the website to check out raw to ums:

they seem to vary it a bit
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6 years ago
#783
(Original post by Dirtybit)
Lmao... Think you've over complicated it there
Loooool.....duuuude the CYCLOTRON! I was trying to contain my laughter when I saw that .

How did you find the paper?
0
6 years ago
#784
(Original post by The H)
Yeah, i got that except I think i used 3 sig figs in the time
Cool that was my answer too But can you remember what the part which they asked you about after was?
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6 years ago
#785
Quite and easy paper, Some tricky multiple choices as usual though.
For the fields question when it was on about the angles was it 60 or 150 and then was the next bit 5pi/6? And for the graph you just had to draw was just a simple sine graph?
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6 years ago
#786
(Original post by MSI_10)
Would sig figs matter in this case?
I don't think so
0
6 years ago
#787
(Original post by S1L3NTPR3Y)
Cool that was my answer too But can you remember what the part which they asked you about after was?
Explain why time is independent of radius?

Did PI R / V is T subbed it into r=mv/bq, radius is removed from eqn so there's the explanation?
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6 years ago
#788
(Original post by flashbackto1999)
no there was an equal and opposite force in either side of the coil.
look up what definition of couple is.
1
6 years ago
#789
what did people put for the direction of the applied magnetic force?
0
6 years ago
#790
(Original post by Robmarkey)
Quite and easy paper, Some tricky multiple choices as usual though.
For the fields question when it was on about the angles was it 60 or 150 and then was the next bit 5pi/6? And for the graph you just had to draw was just a simple sine graph?
Agree with all of that but i drew a negative sine graph instead of a normal one....
3
6 years ago
#791
(Original post by S1L3NTPR3Y)
Cool that was my answer too But can you remember what the part which they asked you about after was?
I think it was where you show that the time is independant of the radius? Or something like that
0
6 years ago
#792
(Original post by foximus)
look up what definition of couple is.
I said the couple answer. Is that correct? I had no idea on that one

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0
6 years ago
#793
(Original post by foximus)
look up what definition of couple is.
Thing is surely it wouldn't be either of them then as they mean exactly the same thing? So one couldn't be wrong while the other is right? I remember putting C I think can't remember exactly what it was but it wasn't the couple or the equal and opposite forces or the "displacing the coil" option...

EDIT: Having seen the link posted by flashback I definitely didn't put C... can't remember which one I put lol
0
6 years ago
#794
For question 5 I'm fairly certain it was 60 degrees for the first one and then 5pi/6 for the second (radians) one....
0
6 years ago
#795
(Original post by foximus)
look up what definition of couple is.
It was the same question as a past paper, Q14. The mark scheme says A.

http://papers.xtremepapers.com/AQA/P...W-QP-JAN03.pdf
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6 years ago
#796
(Original post by Robmarkey)
Quite and easy paper, Some tricky multiple choices as usual though.
For the fields question when it was on about the angles was it 60 or 150 and then was the next bit 5pi/6? And for the graph you just had to draw was just a simple sine graph?
it was 150 for max emf (this is when the magnet was next ppd to the field since it was rotating anticlockwise)
and pi/3 (ie 60) for max flux (as this occurs when magnet is parallel to the field
1
6 years ago
#797
(Original post by marcolliwright)
Thing is surely it wouldn't be either of them then as they mean exactly the same thing? So one couldn't be wrong while the other is right? I remember putting C I think can't remember exactly what it was but it wasn't the couple or the equal and opposite forces or the "displacing the coil" option...
Doesnt equal and opposite forces mean that the coil will be stationary. When it is spinning, both forces are in the same direction(which is a couple), otherwise how would it spin... aduno im no genius

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0
6 years ago
#798
(Original post by flashbackto1999)
It was the same question as a past paper, Q14. The mark scheme says A.

http://papers.xtremepapers.com/AQA/P...W-QP-JAN03.pdf
WOOOOOHOOOOO! I got me.....1 mark
0
6 years ago
#799
(Original post by Jack93o)
not sure, heres the website to check out raw to ums:

they seem to vary it a bit
Pshh vary my ass. Only by a couple of marks

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0
6 years ago
#800
That was a nice paper?

Away and feck. It was awful. Hopefully Unit 5 is alright
0
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