If a = 3.0 mm, b = 4.0 mm, Q, = 60 nC, Q2 = -80 nC, and q = 36 nC in the figure, what is the magnitude of the total electric force on q? Answer = 3.8 N a b Q1

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Q: ok i understand much better now but where did the 0.258 come from (multiplied to 17)

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Dielectric Constant Of Water

Water constitutes about 70% of earth.  Some important distinguishing properties of water are high molar concentration, small dissociation constant and high dielectric constant.

Electrostatic Potential and Capacitance

An electrostatic force is a force caused by stationary electric charges /fields. The electrostatic force is caused by the transfer of electrons in conducting materials. Coulomb’s law determines the amount of force between two stationary, charged particles. The electric force is the force which acts between two stationary charges. It is also called Coulomb force.