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

In the figure 21-29, particles 2 and 4, of charge -e, are fixed in place on a y axis, at y2 = -7.20 cm and y4 = 16.6 cm. Particles 1 and 3, of charge -e, can be moved along the x axis. Particle 5, of charge +e, is fixed at the origin. Initially particle 1 is at x1 = -9.84 cm and particle 3 is at x3 = 9.84 cm. (a) To what x value must particle 1 be moved to rotate the direction of the net electric force net on particle 5 by 30.1o counterclockwise? (b) With particle 1 fixed at its new position, to what x value must you move particle 3 to rotate net back to its original position?

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....................4....................

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-------1------5-------3------

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....................2....................

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I tried to represent the picture that was provided as accurate as possible.

here is the actual picture that I was provided with.

http://edugen.wiley.com/edugen/courses/crs1650/art/qb/qu/c21/fig21_38.gif

2. Relevant equations

Ok I know that I am supposed to use

F_{E}= k(Q_{e}*q_{p})/r^{2})

I can get the force that each one has on point 5 just by using the equation above but then I am stuck.

3. The attempt at a solution

I have not attempted the solution yet because I don't know where to start.

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# Homework Help: Coulomb's Law Can someone please help I don't understand how to do this.

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