Two point charges are fixed on the y axis: a negative point charge q 1 = -32 ?C

Question

Two point charges are fixed on the y axis: a negative point charge q1 = -32 ?C at y1 = +0.17 m and a positive point charge q2 at y2 = +0.33 m. A third point charge q = +9.1 ?C is fixed at the origin. The net electrostatic force exerted on the charge q by the other two charges has a magnitude of 30 N and points in the +y direction. Determine the magnitude of q2.

Two point charges are fixed on the y axis: a negative point charge q1 = -32 ?C at y1 = +0.17 m and a positive point charge q2 at y2 = +0.33 m. A third point charge q = +9.1 ?C is fixed at the origin. The net electrostatic force exerted on the charge q by the other two charges has a magnitude of 30 N and points in the +y direction. Determine the magnitude of q2. Number

Explanation / Answer

Fnet = k*q1*q/0.17^2 - k*q2/q/0.33^2

30 = 90 - 0.752*10^6*q2


q2 = (90-30)/0.752*10^6 = 79.8*10^-6 C

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