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# Edexcel Unit 4: Physics on the Move 6PH04 (11th June 2015) watch

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1. (Original post by Undisclosed 15)
Can anyone explain these 2 questions to me?

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I have not done the first one yet but the second one is F=ma=mdv/dt= d(mv)/dt
So the gradient of the line!

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2. (Original post by BP_Tranquility)
Does anyone know of any places to get a load of difficult unit 4 questions?

I found this custom made unit 4 paper on TSR but it doesn't have a mark scheme- would greatly appreciate it if someone made one though!!
http://www.thestudentroom.co.uk/show....php?t=1160855
Scribd 300 pages of old questions mate!

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3. Okay so ive done 2 Unit 4 papers
Jan 2010 72/80
June 2010 63/80
Basically I get the capacitor questions mostly wrong when I do them, any advice or resources to get better at them?

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4. The magnetic field is into the page. Using the left hand rule, I figured that D was negatively charged.

BUT the book says that C is negative, meaning D is positive. I dont understand..
Attached Images

5. I don't understand why this question is A. I got 1.2 Wb when doing the question.

6. (Original post by J_T_)
I don't understand why this question is A. I got 1.2 Wb when doing the question.

Flux linkage is NBA so 50x0.06x0.06x0.4= 0.072
7. (Original post by haappy17)
The magnetic field is into the page. Using the left hand rule, I figured that D was negatively charged.

BUT the book says that C is negative, meaning D is positive. I dont understand..
I have the same revision guide and I got D is negative as well so you're not going mad. Must be an error in the book.. Noticed a couple of small errors in it actually, which really isn't helpful.
8. (Original post by iceangel8)
Flux linkage is NBA so 50x0.06x0.06x0.4= 0.072
Thanks. It's a bit annoying that they were really vague with the dimensions of the square because all they said was "the sides".
9. (Original post by kor97)
I have the same revision guide and I got D is negative as well so you're not going mad. Must be an error in the book.. Noticed a couple of small errors in it actually, which really isn't helpful.
Looking at the question I agree with you two.

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10. For anyone who's done the v difficult Jan 2012 paper and was confused about the Ampere's law question, this vid explains it q well https://youtu.be/BXKihkHjYes?t=3m40s
11. (Original post by cerlohee)
For anyone who's done the v difficult Jan 2012 paper and was confused about the Ampere's law question, this vid explains it q well https://youtu.be/BXKihkHjYes?t=3m40s
Do you know the right hand grip rule?

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12. (Original post by physicsmaths)
Do you know the right hand grip rule?

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Yea right thumb is the current, right fingers are the magnetic field
13. (Original post by cerlohee)
Yea right thumb is the current, right fingers are the magnetic field
Good just checking 👀 lol.

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14. (Original post by physicsmaths)
Good just checking 👀 lol.

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hahaha
did you think it was an easy q?
15. (Original post by cerlohee)
hahaha
did you think it was an easy q?
Havent done it yet ony done jan jun 2010. Im pretty good at fields though. Capacitors are mindblowing.

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16. (Original post by physicsmaths)
Havent done it yet ony done jan jun 2010. Im pretty good at fields though. Capacitors are mindblowing.

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Oh okay. Yeah I'm still not that good haha, but getting better (y)
What do you get wrong with the capacitors questions? It's always saying what happens when charging, or what happens when discharging and then doing a RC calculation to work out if the capacitor will be sufficient (which it always is) haha
17. (Original post by cerlohee)
Oh okay. Yeah I'm still not that good haha, but getting better (y)
What do you get wrong with the capacitors questions? It's always saying what happens when charging, or what happens when discharging and then doing a RC calculation to work out if the capacitor will be sufficient (which it always is) haha
I am just so off with some the questions. I get charging and discharging but dont understand some of the longer written questions. The calculations are easy though.

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18. Does anyone know where I can find the answers to the unit 4 paper in the A2 hodder physics textbook?

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19. (Original post by physicsmaths)
Havent done it yet ony done jan jun 2010. Im pretty good at fields though. Capacitors are mindblowing.

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How many papers are you planning on completing?

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20. Can anybody explain the answers for the following MCQ's of the June 2011 phy U4 paper plz:
06)
10)
Oh and the question #14

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Updated: June 16, 2015
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