Electrostatics question

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IState21

Joined Sep 20, 2010
4
Determine the amount of work needed to transfer two charges of 40nC and -50nC from infinity to locations (0,0,1) and (2,0,0) respectively.

I got an answer but it doesn't seem right,

W=(1/(4∏ε))*((40n*-50n)/(mag((2,0,0)-(0,0,1)))
W=-8.05 μN

any suggestions?
 
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