- #1
mussgo
- 14
- 0
i just need to get this question over with
i tried and tried but i couldn't get the right answer plss anyone u.u
1. Homework Statement
point charges q1 = -6q and q2 = +3q are separated by distance d. Locate the point (measured from the origin at q1) at which the electric field due to the two charges is zero.
<img src=http://www.webassign.net/hrw/23_30.gif>
2. Homework Equations
E=kQ/x^2
3. The Attempt at a Solution
well i did 0= E1+E2
i got this
0 = 3kQ/x^2 - 6kQ/(x+d)^2
6kQ/(x+d)^2 = 3kQ/x^2
cross multiplied
2x^2 = x^2 + 2dx + d^2
x^2 - 2dx - d^2 = 0
and then i did quadratic formula and got d-+d(sqrt2)
like 2.414d and .414 but as i put them in the webassign i got em wrong
can anyone help or tell what i did wrong or any feedback would be apreciated u.u
i tried and tried but i couldn't get the right answer plss anyone u.u
1. Homework Statement
point charges q1 = -6q and q2 = +3q are separated by distance d. Locate the point (measured from the origin at q1) at which the electric field due to the two charges is zero.
<img src=http://www.webassign.net/hrw/23_30.gif>
2. Homework Equations
E=kQ/x^2
3. The Attempt at a Solution
well i did 0= E1+E2
i got this
0 = 3kQ/x^2 - 6kQ/(x+d)^2
6kQ/(x+d)^2 = 3kQ/x^2
cross multiplied
2x^2 = x^2 + 2dx + d^2
x^2 - 2dx - d^2 = 0
and then i did quadratic formula and got d-+d(sqrt2)
like 2.414d and .414 but as i put them in the webassign i got em wrong
can anyone help or tell what i did wrong or any feedback would be apreciated u.u
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