Point charge / potential / work

[sebby]

Homework Statement

Two point charges q1 = +2.80 nC and q2 = -6.30 nC are 0.100 m apart. Point A is midway between them and point B is 0.080 m from q1 and 0.060 m from q2 (Fig. 23.29). Take the electric potential to be zero at infinity.

***Figure attached***

(a) Find the potential at point A.
correct

(b) Find the potential at point B.
correct

(c) Find the work done by the electric field on a charge of 2.50 nC that travels from point B to point A.

Homework Equations

V= k summation( q/r) of each charge and radius
w = q(delta v)

The Attempt at a Solution

when answering (a) and (b) i got -630 and -630 so by the second relevant equation the answer to (c) should be "0" but i got that answer wrong.

what am i doing wrong

 

[anathema]

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Thank you for your post. I am a scientist and I would be happy to help you with your question. For part (c), you are correct that the work done by the electric field is zero. This is because the electric potential at both point A and point B is the same, -630 V, and therefore there is no change in potential as the charge travels from point B to point A. The equation you used, W = q(delta v), is correct. However, in this case, delta v is equal to zero, so the work done is also zero. I hope this helps clarify your answer. Let me know if you have any further questions.

 

[baba89]

?



Based on the provided information and equations, it seems like you are on the right track. However, I would recommend double-checking your calculations and making sure that you are using the correct units for all the values. It is also important to consider the sign convention for electric potential, which is typically taken to be positive for positive charges and negative for negative charges. This may affect your final answer for part (c). Additionally, make sure you are using the correct values for the charges and distances for points A and B, as they may differ from the values given for q1 and q2. I hope this helps and good luck with your calculations!