Physics: Post your doubts here!

[krishnapatelzz]

Hi, can someone please explain how to do the graph for part c? this is mj 2016 paper 42

 

[Thought blocker]

HAhahhaa.... MISS OUR TIME OF PHYSUCKS

 

[krishnapatelzz]

HAhahhaa.... MISS OUR TIME OF PHYSUCKS

yaaaaaaaaaa!!!!!!!!!!!!!!!!!!!!

 

[nadeen64]

mj 2016/42 q 9 bii
Help anyone??

 

[AnonymousX9]

Hey guys, I have this doubt that's been bugging me for so long now.

Why is the electric potential inside a charge conducting sphere constant?
Why is the electric field inside a charge conducting sphere equal to zero? (I know that since there is no change in potential, E = 0 but isn't there any explanation for that?)

It'd be really helpful if you guys could clear this for me and I'd love a simple/precise explanation that is A Level based.

Thank you.

 

[DragonCub]

Hey guys, I have this doubt that's been bugging me for so long now.

Why is the electric potential inside a charge conducting sphere constant?
Why is the electric field inside a charge conducting sphere equal to zero? (I know that since there is no change in potential, E = 0 but isn't there any explanation for that?)

It'd be really helpful if you guys could clear this for me and I'd love a simple/precise explanation that is A Level based.

Thank you.

Both questions can be answered by the same fact: electric charge is distributed uniformly inside the conducting sphere.

When outside the sphere, the electric field is not uniform - it is more concentrated nearer the sphere surface. This means there is a "concentration gradient" outside the sphere (with respect to distance).
Electric field is actually a measure of the magnitude of this gradient.
Electric potential is actually a measure of the integral of this gradient.

But when inside the conducting sphere, charge is uniform everywhere, meaning there is no such gradient, or gradient is zero.
Since gradient = 0 everywhere in the sphere:
- Electric field is zero.
- The integral is constant, which means electric potential is constant.

 

[Shuddho Ukil]

Could really use some help here with this question!

'' A hard ball and a soft ball, with equal masses and volumes, are thrown at a glass
window. The balls hit the window at the same speed. Suggest why the hard ball is more
likely than the soft ball to break the glass window. ''

 

[Thought blocker]

Could really use some help here with this question!

'' A hard ball and a soft ball, with equal masses and volumes, are thrown at a glass
window. The balls hit the window at the same speed. Suggest why the hard ball is more
likely than the soft ball to break the glass window. ''

http://physics-ref.blogspot.in/2015/01/physics-9702-doubts-help-page-48.html
See Q two eighty eight

 

[Djlucifer]

um..............I am giving my AS level in May/June 2017 session and now I have around 50 days in my hand and what do I do to get most of the marks as in an A and how do I plan my revision time

 

[OmarKhan99]

9702_s15_qp_41, Question 12(c)(i)

Can someone tell me how to solve this question? I tried my method, but it's way off the MS.
Thanks in Advance.

 

[alevel_student]

Can someone solve b iv) and explain how to do it

 

[DragonCub]

Can someone solve b iv) and explain how to do it

 

[i_try9621]

um..............I am giving my AS level in May/June 2017 session and now I have around 50 days in my hand and what do I do to get most of the marks as in an A and how do I plan my revision time

Do a lot of past papers. That's how I revise usually and definitely read the notes.

 

[i_try9621]

Q5 b) ii) from 41/O/N/15

 

[Djlucifer]

what else any specific tips about practical as in manipulation in results

 

[areeba240]

(iii)

 

[Thought blocker]

View attachment 61794
(iii)

18000Hz ?

 

[areeba240]

18000Hz ?

yes but how?

 

[areeba240]

9702/41/O/N/13
qtn 11 (a) & (c)
can someone plzz explain

 

[Thought blocker]

yes but how?

918000-900000