Find the potential at point A . Find the potential at point B . Find the work do

Question

Find the potential at point A.

Find the potential at point B.

Find the work done by the electric field on a charge of 2.90nC that travels from point B to point A.

Two point charges q1 = 2.00nC and q2 = -6.70nC 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 (the figure(Figure 1) ). 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 2.90nC that travels from point B to point

Explanation / Answer

a) VA = kq1/r1 + k q2/r2 = 9e9*2e-9/0.05 + 9e9*(-6.7e-9)/0.05 = -846 V

b) VB = kq1/r1 + k q2/r2 = 9e9*2e-9/0.08 + 9e9*(-6.7e-9)/0.06 = -780 V

c) W = q V = 2.90e-9 * (-780 - (-846)) = 1.91 x 10^-7 J

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