There are two solutions in one image-charge problem?

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The discussion centers on two different solutions to a charge problem, one from Griffiths and another from a lecturer, which are inconsistent with each other. Participants are seeking clarification on which solution is correct. One contributor notes that Griffiths provides an alternative method for calculating work, suggesting that integrating the force over a specified path can simplify the problem. There is a suggestion that the thread may be better suited for a homework forum, but it remains in its current location for now. The conversation highlights the confusion arising from differing approaches to the same physics question.
garylau
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there are two different solutions in one question
! which one is correct??
the first one is written by griffiths

the second one is written by a lecturer.

they are not consistent in the same question
So which one is correct?
thank you
 

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Well, in the preceding section Griffiths gives an alternative way to calculate the work !
It's not too complicated to integrate the force you calculated over the path bx = ay from ##\infty## to ##(a,b)## .
(And you can simplify by setting ##a=b## -- all you're after is factor of 2).

This thread should be in the homework forum.
 
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BvU said:
This thread should be in the homework forum.
It looks more like a studying question so far, so we can leave it here for now.
 

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