(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

Two point charges, q1 and q2, are placed 0.30m apart on the x-axis, as shown in the figure(http://hiviz.org/apb89/ap/problems/2006-3.jpg). Charge q1 has a value of -3.0x10^-9 C. The net electric field at point P is zero.

A) What is charge of q2 (Positive/Negative)

B) Calculate magnitude of charge q2

C) Calculate magnitude of electric force on q2 and give direction.

D) Determine x-coordinate of point on line between 2 charges at which electric potential is 0.

E) How much work must be done by an external force to bring an electron from infinity to the point at which the electric potential is zero?

2. Relevant equations

F = k*|q1|*|q2|/r

V = kq/r

3. The attempt at a solution

A) I believe the charge is positive because if the net force is zero, then the positive charge would have to counteract the negative charge of q1.

B) I think I am supposed to use F = k*|q1|*|q2|/r. Do I just set that equal to zero, since the net force is zero at point P?

C) Don't know where to start here

D) V= kq/r? There is only one q in that equation though, so I'm not sure how to do it.

E) Don't know how to start this one either.

Any suggestions/hints would be great. Thanks!

1. The problem statement, all variables and given/known data

2. Relevant equations

3. The attempt at a solution

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# Net Force of Point Charges

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