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Two point charges, q1= 2.40 nC and q2= -6.50 nC, are 0.100 m apart. Point A is midway between them; point B is 0.080 m  from q1 and 0.060 m  from  q2 (see the attachment). Take the electric potential to be zero at infinity.
Find the potential at point A.
Find the potential at point B.
Find the work done by the electric field on a charge of 2.80 nC that travels from point B to point A.

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