# Coulomb's law and net force

mimictt
I don't really know how to solve this problem. I only know how to calculate the net force on B, not A...

here is the problem:
sphere A is located at the origin and has a charge of +2.0x10^-6 C.
Sphere B is located at +.6m on the x-axis and has a charge of -3.6x10^-6 C. Sphere C is located at +.8 m on the x-axis and has a charge of +4.0x10^-6 C. Determine the net force on sphere A.

I know how to find the net force on sphere B, since it's in the middle... but i have no idea when it comes to sphere A... would the net force on sphere A be the same as the net force on sphere C?

Thank you!

PS:im new to this forum!! :D

cupid.callin
Write forces on A, the one acting along +X axis ... take them positive and the opposite, take them negative ...

Keep in mind that like charges repel and unlike charges attract!!

mimictt
Write forces on A, the one acting along +X axis ... take them positive and the opposite, take them negative ...

Keep in mind that like charges repel and unlike charges attract!!

meaning that i should calculate the FC on A and FB on A
and then subtract these two forces to get a net force on A?

cupid.callin
yes
because C will push A along -X and B will attract A along +X

mimictt
yes
because C will push A along -X and B will attract A along +X

THank you so much!