# Search results

1. ### How does the Xenon Flash in Lumia; or, if fact any compact device work

I mean to ask if there is some other work around. Putting massive capacitor in a cell phone is nearly impossible.
2. ### How does the Xenon Flash in Lumia; or, if fact any compact device work

I don't need basics, I know the causes how xenon flash "works" ; I need to know how do they minimise this kind of circuit in microprocessor? My question: The Flash tubes require kVs of potential difference to work. I am aware that big capacitors are required to make them work. This is okay...
3. ### Evaluate the Limit (just confirmation)

Assumed he meant x^(1/3) *kids today*
4. ### Integration methods help!

Seems to me Exponential Expansion'd be better.. But what kind of question is this, anyways?
5. ### Evaluate the Limit (just confirmation)

My bad! you have! And when you reach L'Hopital's rule, revisit these questions..
6. ### Evaluate the Limit (just confirmation)

Precisely, Although It'd be nicer if you had done some substitutions.. Yeah is correct!
7. ### Applications of derivative Question> Tangents

The motive was to find the tangent.. But I cant seem to find it.. when I plot the graph to this yperbola, I just CANT figure out how to proceed! HELP! PS: This question was in exams today.. If the question is missing some info, please mention -.-
8. ### Electrostatics question. just need a bit direction.

by this, do you refer to force inside the atom, between electron and proton, or between atoms. and thanks fir quick reply. :-)
9. ### Electrostatics question. just need a bit direction.

I was trying to solve this one, but couldnt come up with any way to start. In 1959 Lyttleton and Bondi suggested that the expansion of the Universe could be explained if matter carried a net charge. Suppose that the Universe is made up of hydrogen atoms with a number density N, which is...
10. ### Quadratic problem. any other method?

Thanks for reply. Yes I understand what you meant. Can you suggest some good method for this problem? Let P1(x) = ax2 − bx − c, P2(x) = bx2 − cx − a, P3(x) = cx2 − ax − b be three quadratic polynomials where a, b, c are non-zero real numbers. Suppose there exists a real number α such...
11. ### Quadratic problem. any other method?

quadratic problem. any other method?? 1. Thie problem statement, all variables and given/known data I was solving this question paper and came across the second problem : http://olympiads.hbcse.tifr.res.in/uploads/rmo-2010 [Broken] I wanted to solve this one by calculus. I want to know...
12. ### Complex power raised over real number.

well thats obvious, isnt it? trigo fn is periodic, i just stayed in principle branch
13. ### Complex power raised over real number.

Yeah this is obviously much better, I was just looking whether it is even possible or not as none of the books I use has such question. Would be awesome if you could suggest some good book for complex number (pre collage).
14. ### Complex power raised over real number.

1. I actually dont know if such kind of operation is even allowed. A friend of mine raised this question, that can we raise a complex power over a real number. I solved it this way. Is this correct? http://i45.tinypic.com/254vwux.jpg Homework Statement Homework Equations The Attempt at...
15. ### Simplifying a summation

As far as I know, it is called AGP, arithmetico-geometric progression.
16. ### Electrostats, Gauss Theorem qusetion: Struck in middle

1. The question is to find the volume charge density. Given is non uniform, but spherically symmetric electric field, E=K.r4, K being a constant. Original question can be viewed in image: * Question no. 53 Homework Equations Answer is: ρ=6Kr3ε The Attempt at a Solution...
17. ### Electrostats, Electric potential question. Need a little direction.

Really!? :shy: Then I think I am going in correct way! Thank you ehild for the help. :redface: I'll be posting some other questions as I proceed in the chapter. Would love to ask help again :) :approve:
18. ### Electrostats, Electric potential question. Need a little direction.

I have this thing in my mind: PE of system is PE due to interaction between individual charges. Now, if -q coincides with either 2q or 8q, the resultant PE would be -∞. Any finite value (in this case interaction between 2q and 8q) when added to -∞ will be equal to -∞. And since the...
19. ### Electrostats, Electric potential question. Need a little direction.

I guess minus infinity.. Since PE is scaler, we need to put sign in the expression.. And this would lead to negative side of infinity as far as mathematics is concerned..
20. ### Electrostats, Electric potential question. Need a little direction.

As far as I know, it should be ∞ as r->0 PF->∞ Let me know if i am wrong, I have started the chapter a day ago.
21. ### Electrostats, Electric potential question. Need a little direction.

Answer is, as i have mentioned, D. None of these. Problem is I cant figure out if my method is even correct. I am on my summer vocations, so cant get to my instructor for directions. If some good guy greg here tell me which method he would use i would appreciate it! :-)
22. ### Electrostats, Electric potential question. Need a little direction.

Here is my full working for the initial part. Got same expression each time I did the question. http:// i46.tinypic . com/33w9s92.jpg PS: I cant post links, because I havent reached 10 posts yet.
23. ### Electrostats, Electric potential question. Need a little direction.

Homework Statement Two point charges 2q and 8q are placed at a distance r apart. Where should a third charge -q be placed between them so that the electrical potential energy of the system is minimum. a). at a distance r/3 from 2q b). at a distance 2r/3 from 2q c). at a distance r/16 from 2q...
24. ### Need help for integration

Yes, that Exactly is the problem i am facing.. I have added picture of my notebook. My teacher had given only that much data... And I think from this data we should assume that path was straight line from (0,0) to (3,4)
25. ### Need help for integration

1. F= 5y i + 6x j (in component form) Find the work done in displacing from (0,0) to (3,4) 2. W= ∫F ds in this case, W= ∫5y dx + ∫6x dy With lower limits 0,0 And upper Limit 3,4 3. Now My question, how do i integrate when variables are different?