- #1
zorro
- 1,384
- 0
Homework Statement
The arrangement is as shown in the figure.
Find the work done to increase the spacing between the wire and the loop from a to 2a.
The Attempt at a Solution
I calculated the potential energies in initial and final configurations using U=-M.B (all vectors)
I got
I have a problem finding out the work done from this.
Work done by a conservative field is defined as the negative of Uf - Ui .
But my book just uses W.D. = Uf - Ui without any negation.
Where is my mistake?