Can anyone demonstrate how to get the answers to these questions? I'm just interested in the method I need to use in order to obtain the correct answer no matter what the values are.
Three small spheres are placed at fixed points along the x-axis, whose positive direction points towards the right.
Sphere A is at x = 36.0 cm, with a charge of –8.00 μC.
Sphere B is at x = 41.0 cm, with a charge of 9.00 μC.
Sphere C is at x = 46.0 cm, with a charge of –3.00 μC.
a) Calculate the magnitude of the electrostatic force on sphere B.
b) Sphere B is now removed: What would be the magnitude of the electric field at the point where sphere B was located?
c) Sphere B is still missing. Give the x-coordinate of the point on the x-axis where the field due to spheres A and C is zero