Part A A point charge with charge q 1 = 3.90 u C is held stationary at the origi

Question

Part A

A point charge with charge q1 = 3.90uC is held stationary at the origin. A second point charge with charge q2 = -4.10uC moves from the point ( 0.170m , 0) to the point ( 0.270m , 0.270m ). How much work W is done by the electric force on the moving point charge?

Part A A point charge with charge q1 = 3.90uC is held stationary at the origin. A second point charge with charge q2 = -4.10uC moves from the point ( 0.170m , 0) to the point ( 0.270m , 0.270m ). How much work W is done by the electric force on the moving point charge? Express your answer in joules. Use k = 8.99½109N * m^2 / C^2 for Coulomb's constant: k =1 / 4 Pi E0

Explanation / Answer

W = k*q(1)*q(2)*[1/r(1) - 1/r(2)]

k = 9*10^9 Nm^2/C^2

okay, r(1) is the distance from the origin to your starting point
r(1) = .170 m

r(2) is the distance from the origin to your ending point
r(2) = sqrt(.27^2 + .27^2)
r(2) = 0.381

you have q(1) and q(2) in the question

W = k*q(1)*q(2)*[1/r(1) - 1/r(2)]
W = 9*10^9*3.90*10^-6*(-4.10*10^-6)*(1/.17 - 1/.381)

W = -0.468 J

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