Physics: Post your doubts here!

[Zepudee]

Hi anyone here, can help me to evaluate electric potential graph and electric field strength graph? I always find it confusing. Can anyone help me?

 

[Bba321]

Please explain me qs 3 part d
Thanks

http://papers.xtremepapers.com/CIE/...and AS Level/Physics (9702)/9702_w06_qp_2.pdf

 

[manutd96]

http://papers.xtremepapers.com/CIE/...and AS Level/Physics (9702)/9702_s09_qp_2.pdf

Paper 21 Q7(a)(ii), how do we know its 0.5R? how do we see that it is parallel? and lets say if a third resistor of same resistance is added in parallel, is the resistance AB still the same or different?thanks

 

[TimBluesWin]

look at qu 23 at
http://physics-ref.blogspot.com/2014/10/physics-9702-doubts-help-page-4.html

and SIstudy

solutions for the june 2014 papers are available at http://physics-ref.blogspot.com/2014/05/physics-9702-notes-worked-solutions-for.html

Heyy.. Sorry late reply.... But isn't the diagram shown at qu 23 is galvanometer? Also I don't understand the may/june 2009 no 9b... Any help would be appreciated. Thanks!!

 

[manutd96]

than

solutions have been posted at

http://physics-ref.blogspot.com/2014/11/9702-june-2009-paper-21-worked.html

thanks but i am still a bit unsure. does it mean that the resistance between BY BX CX are the same? meaning the total resistance between BY BX CX is the total resistance of the resistors in parallel. is this true?

 

[Bba321]

Hey can anyone please explain qs 5c part 2?

http://papers.xtremepapers.com/CIE/...and AS Level/Physics (9702)/9702_w05_qp_2.pdf

Thanks

 

[SIstudy]

all of them have been explained at

http://physics-ref.blogspot.com/2014/10/9702-june-2010-paper-21-worked.html

umm I don't get it
in Q4 part (b)if you're using the formula, means there's 2 unknowns D and n.
and isn't D 165 cm given in the question?
secondly, aren't we supposed to use this formula for double slits only?
and in Q4 part (C)
why doesn't P rotate at 90 degree as well|?

 

[manutd96]

I've added some more details there. See if it helps now, or are you still in doubts?

okay, i understand it now. thanks a lot for your help.

 

[manutd96]

I've added some more details there. See if it helps now, or are you still in doubts?

okay, i understand it now. thanks a lot for your help.

 

[Bba321]

details are available at
http://physics-ref.blogspot.com/2014/09/9702-november-2005-paper-2-worked.html

Thanks !!
Please help me with qs 5b and 6b

http://papers.xtremepapers.com/CIE/...and AS Level/Physics (9702)/9702_w04_qp_2.pdf

Thanks

 

[arvin vinz]

Hi..can anyone help me with this question??

 

[SIstudy]

i've added more details. be sure to read it carefully. it's good that you clear this before the exam. I hope you identified your mistake

Oh my Godd
yes I did realize my mistake, thanks A LOT, Jazak'Allah

 

[priya_sharma]

guyzz can anyone hlp me with w12 paper 4 Q9 b (i)
the graph i dont understand how to draw it...
wat is a square wave??
http://papers.xtremepapers.com/CIE/...nd AS Level/Physics (9702)/9702_w12_qp_42.pdf
plz hlp[ me fast i have a paper to write tomrw

 

[priya_sharma]

i have added the graph at

http://physics-ref.blogspot.com/2014/07/9702-november-2012-paper-41-42-worked.html

thnxx friend can u tell me on wat topic to focus on i have my alevel physics p4 tomrw
plzz tell me wat paper to solv or any tips plzz

 

[Bba321]

Please help me with qs 5b and 6b

http://papers.xtremepapers.com/CIE/...and AS Level/Physics (9702)/9702_w04_qp_2.pdf

Thanks

 

[robinhoodmustafa]

check q22 at http://physics-ref.blogspot.com/2014/10/physics-9702-doubts-help-page-4.html

the other should also look at it.

and if anyone can explain it in a more appropriate way, you are welcome to share your explanation

Can u please share the link for November 2006 doubts

 

[SIstudy]

http://papers.xtremepapers.com/CIE/...nd AS Level/Physics (9702)/9702_s11_qp_21.pdf
Please help me with Q1 B (i)
and Q5 a (ii) and part b

 

[SIstudy]

http://papers.xtremepapers.com/CIE/...nd AS Level/Physics (9702)/9702_w11_qp_21.pdf
Q1 c(ii) i don't understand how the area is calculated, please explain :/

 

[TimBluesWin]

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Physics (9702)/9702_s11_qp_21.pdf
Please help me with Q1 B (i)
and Q5 a (ii) and part b

1b. Use formula R=(p*l)/A (p is resistivity, l is length, A is cross-sectional area of wire, use formula A=pi*(0.5*d)^2 R is resistance)
So you just input the original measurement into the equation.
5a (ii) Okay so you've found 0.667 for the minimum current. So you can draw a curve with decreasing gradient as R increases. (As V=IR) (I gave a picture of it)
5b. To find the minimum/maximum current, you need to find the minimum/maximum voltage first.
Maximum voltage: 12/12*12=12V. Hence Max current= 12V/6=2A
Minimum voltage: 0/12*12=0V. Hence min current: 0A

Hope I am right, if I'm wrong, just tell me.

 

[TimBluesWin]

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Physics (9702)/9702_w11_qp_21.pdf
Q1 c(ii) i don't understand how the area is calculated, please explain :/

Area is just either length*width, length*height, or width*height. Since the question asks about the maximum pressure, just select the two shortest sides to be multiplied to obtain maximum pressure.