Aparticle with charge 3 µc is located on the x-axis at the point −10 cm , and a second particle with charge −5 µc is placed on the x-axis at 6 cm . −10−8 −6 −4 −2 2 4 6 8 10 3 µ c − 5 µ c − 7 µ c x → (cm) what is the magnitude of the total electrostatic force on a third particle with charge −7 µc placed on the x-axis at 2 cm ? the coulomb constant is 8.9875 × 109 n · m 2 /c 2 . answer in units of n.