Two point charged particles are initially 7.12 cm apart, are moved in a new location. The force between the is found to have been quadrupled. How far apart are they now?

In a salt crystal, the distance between adjacent sodium and chloride ions is 2.8×10−10×10−10 m. What is the force of attraction between the two singly charged ions?

We move the +Q and +4Q charges to be 3 times as far apart as they were.  What is the magnitude of the force on the +4Q charge?

Part (a) Use these numbers: Q₂ = -500 nC. When the second particle is placed on the x-axis at x = +27.0 cm, it experiences a force of 1.20 N in the positive x-direction. When the second particle is moved to x = +36.0 cm on the x-axis, it experiences a force of 3.50 N in the negative x-direction. Determine the location of the mystery charge. X = cm Type your numeric answer and submit Part (b) Determine the sign and magnitude of the charge on the mystery particle. Express your answer in nanocoulombs. nC Type your numeric answer and submit ✰