Work to move charge to infinity?

AI Thread Summary
The discussion revolves around calculating the work required to move a +2.7-µC charge to infinity in a system of charges arranged in a rectangle. The user initially struggles with determining the potential at the charge's location due to a lack of reference points for distance. They express confusion about the formula for work and potential, specifically regarding the variables involved. After receiving guidance, the user successfully resolves the problem and expresses gratitude for the assistance. The conversation highlights the importance of understanding electric potential and work in electrostatics.
awertag
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Homework Statement



The figure below shows three charges at the corners of a rectangle of length x = 0.55 m and height y = 0.35 m.

http://www.webassign.net/walker/20-23alt.gif

(a) How much work must be done to move the +2.7-µC charge to infinity?

Homework Equations



W=(\DeltaV)(q)
V3=potential at the spot of the charge
Q3=2.7e-6 C

The Attempt at a Solution



W=/\VQ
W=V3(Q3)
then try to solve for V3=KQ3/r3 but i know i can't because i don't have an r because there's no reference point for it. So, is there another way to solve for potential or am i just going about the whole thing wrong?

thanks very much

--aweg
 
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hi awertag! :smile:

(have a delta: ∆ and try using the X2 and X2 icons just above the Reply box :wink:)

the work done against two (or more) forces is the sum of the work done against each force …

∫(∑F).d = ∑(∫F.d) :wink:​
 
haha thanks for the delta :)
i actually got the problem, i just was having trouble finding the potentials but I've got it now. Thank you for taking the time to respond, and have a great day!
 

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