Zero point in the electric field

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Homework Statement



Find positions on the x axis for the charges Q1 = -1 C and Q2 = +3 C so that the electric field is zero at x = 0.

Homework Equations



F=Eq
where E=kq/r^2

The Attempt at a Solution


I put q1 and q2 1 meter apart and then found where a third charge would go so the third charge would have a force of zero. My answer for the question is q2 at x=-2.366 and q1 at x=-1.366. Is this right?
 

Answers and Replies

  • #2
SammyS
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Homework Statement



Find positions on the x axis for the charges Q1 = -1 C and Q2 = +3 C so that the electric field is zero at x = 0.

Homework Equations



F=Eq
where E=kq/r^2

The Attempt at a Solution


I put q1 and q2 1 meter apart and then found where a third charge would go so the third charge would have a force of zero. My answer for the question is q2 at x=-2.366 and q1 at x=-1.366. Is this right?
Yes, that is one possible answer. (There are an infinite number of sets of possible answers.)

The important thing is the ratio of the two x coordinates.
 

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