Question

A Charge \[+10^{-19}C\] is located at the origin in free space and another charge Q at (2,0,0).
If the x-component of the electric field at (3,1,1) is zero, calculate the value of Q.





& one more question: -
Is the y-component zero at (3,1,1)?

Answer 1

@experimentX Please help:)

Answer 2

calculate the field at that point ... and also angle with respect to x axis

Answer 3

i don't know how to calculate angle:(

Answer 4

is there any formula?

Answer 5

this is just geometry ... draw picture.

Answer 6

i did
now wt should i do?

Answer 7

oh .. .sorry

Answer 8

I found E at P due to 10^-19 C
& it is (8.1 x 10^-11N/C)

& E at P due to Q is (3Q x 10^9 N/C)
I just calculated these.

Answer 9

E = Electric Field.

Answer 10

find the direction cosines ... multiply the field by direction cosines.

Answer 11

equate them.

Answer 12

Wt is this direction cosine & how to find them?

Answer 13

http://en.wikipedia.org/wiki/Direction_cosine
just alpha of both

Answer 14

"this direction cosine stuff is really tough"
would u plz make me understand by finding first part's electric field's direction cos?

Answer 15

I mean this one's

E at P due to 10^-19 C & it is (8.1 x 10^-11N/C)

Answer 16

I would do the next one:)

Answer 17

try to find the -alpha- direction cosines of the coordinates 000 to 311
http://www.youtube.com/watch?v=rusI0oWFSJw

Answer 18

3-0
-----
length of the 311 to 000

Answer 19

I found the direction cosine of 3,1,1
& it is

@experimentX :)