Question

Electrostatics @Mashy

Answer 1

you have to calculate the work done in moving the charge from A to the centre..
so we need to find potential difference between the centre of the ring (0 potential) and A.. so basically find potential at A

Answer 2

Umm. Sounds good. I'll try and get back.

Answer 3

390 * 10^9/7 potential at A ? :o

Answer 4

=change in KE?

Answer 5

@Mashy sir?

Answer 6

wait arr.. ! you got such high potential :O

Answer 7

Oh right. I dont know what i did. I kinda messed up with the value of charge too. :P

Answer 8

:P.. check that :P.. m watching dbz and doing it :D..

Answer 9

Check what? Next what? Potential difference=change in KE?

Answer 10

@Mashy ?

Answer 11

not potential difference.. work done

work done = pot diff * charge = change in k.E

Answer 12

oh poop. right. wait a min.

Answer 13

Nope i dont get it. The work done comes out to be 2.82J.. 5-2.82=2.18 ? Not the answer. :/ #mustbeasillymistake

Answer 14

@Mashy

Answer 15

yea :(.. i figured too.. something is wrong.. check if my potential calcuation is right

Answer 16

Looks good. :(

Answer 17

lemme think wait!

Answer 18

m not getting it :-/!?

Answer 19

Nvm. I'll post another question. You have explained a similar question to me before in magnetism. But i would like you to explain it to me again. :P

Answer 20

find the total charge first!

Answer 21

umm. (Ca^2/4/3 *pi*a^3) ??

Answer 22

No.. integration of Cr^2*4pir^2dr from 0 to a will be the total charge.

Answer 23

wait arrr

Answer 24

Well that gives me the answer. :D

Answer 25

show the integration!

Answer 26

integration of Cr^2*4pir^2 dr fro 0 to a --> Ca^5*4pi

Answer 27

Cr^2*4pi*r^2 dr

Answer 28

ok done :)

Answer 29

Yeah. Thank you.