Coulomb's law describes how the charge on and distance between two particles affect the electric force between them. Which situation will result in
two particles being repelled by each other?
A. Decreasing the distance between them
B. Increasing the distance between them
C. Both particles having a positive charge
D. One particle having a positive charge and the other a negative
charge

Large electric fields in cell membranes cause ions to move through the cell wall. the field strength in a typical membrane is 1.0 x 10 7 n/c. what is the magnitude of the force on a calcium ion with charge +e? what is its acceleration? is it possible for a particle with the same charge as as calcium to have a different acceleration if placed at this location? what would change the acceleration: mass of the particle? diameter of the particle?