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# Edexcel Physics U4 IAL (WPH04/1)

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1. what did you do on the last part of the ex. with the capcitors the one that youneeded a calculation
2. (Original post by christinasa)
what did you do on the last part of the ex. with the capcitors the one that youneeded a calculation
1/Time constant
3. (Original post by Zacken)
1/Time constant
If i only found time constant how many marks do i get?
4. It's 32 pages! But I think some questions are in past papers.

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5. lol, I've literally forgotten the paper. :/ How did you all find the last question's last two parts though?
6. (Original post by Zacken)
1/Time constant
I gave time constant and said discharging is 3-5 times greater than that value, which still gave a small time value which I said the ammeter will not show sufficiently . Would I get any marks for that?
7. how many marks for 90 ums,
8. (Original post by Zacken)
Yep, Q16 also came up as Q11 in ours. Q15 came up in ours as well. It's basically the same paper with different numbers.

Dunno what the deflection bit you're talking about is. Are you talking about the last question about exiting the field? If so, it exits at C.

Momentum change = 2p.
Why exits at C not D?
9. (Original post by Zacken)
1/Time constant
Why do we need to divide one by RC?
10. was A o B was the path of electron
11. (Original post by nimesh007)
was A o B was the path of electron
I wrote A
12. (Original post by tgygt)
I wrote A

same here, what will b the mark for 90 ums
13. Hey, I think you'd get full marks for the 5RC method. That's what I did. I think 1/RC is a trick they want you to fall for but don't worry should be fine.

For the cushion force-time graph, I drew a wider lower peak? Is that correct?
14. (Original post by highschool)
Hey, I think you'd get full marks for the 5RC method. That's what I did. I think 1/RC is a trick they want you to fall for but don't worry should be fine.

For the cushion force-time graph, I drew a wider lower peak? Is that correct?
Lower peak with longer collision time
I also start the graph 0.1s after the collision starts as the question says it takes 0.1s for airbag to detect and inflate
15. (Original post by highschool)
Hey, I think you'd get full marks for the 5RC method. That's what I did. I think 1/RC is a trick they want you to fall for but don't worry should be fine.

For the cushion force-time graph, I drew a wider lower peak? Is that correct?
yah i thnk so,becz even i drew the same thng, i thnk it will b same grade boundaries like in june 2015, 68 for an A*
16. (Original post by tgygt)
Why exits at C not D?
r = mv/bq. m is 4 times as big, but q is only twice as big. So r_(new) = 2(r_old). i.e: it has a larger radius.
17. What are the differences between cyclotron and linac?

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