A point charge with charge q1 = 3.90 μC is held stationary at the origin. A second point charge with charge q2 = -4.40 μC moves from the point ( 0.150 m , 0) to the point ( 0.280 m , 0.255 m ). How much work W is done by the electric force on the moving point charge?
Express your answer in joules. Use k = 8.99×109 N⋅m2/C2 for Coulomb's constant: k=14πϵ0.
Work done by the electric force on the moving point charge = -change in PE
Potential energy at point 1,
PE1 = kq1q2 / r1
PE1 = 9*10^9*3.90*10^(-6)*-4.4*10^(-6) / (0.15)
PE1 = -1.029 J
Potential energy at point 2,
PE2 = 9*10^9*3.90*10^(-6)*-4.4*10^(-6) / sqrt [(0.28)^2 + (0.255)^2]
PE2 = 0.4078 J
W = -[(-0.4078) - (-1.029)]
W = -0.6217 J
A point charge with charge q1 = 3.90 μC is held stationary at the origin. A...
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