A positively charged particle Q1 = +15nC is held fixed at the origin. A second charge Q2 of mass m = 9.5g is floating a distance d = 25cm above charge Q1. The net force on Q2 is equal to zero. You may assume this system is close to the surface of the Earth.

Calculate the magnitude of Q2 in units of nanocoulombs.

Explanation:

Given

charge on the fixed particle,

mass of the second charge,

distance between the fixed charge and the floating charge on the top,

where:

permittivity of free space

g = acceleration due to gravity

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