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Coulomb's law

by mimictt
Tags: charge, coulomb's law, net force
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mimictt
#1
Jan20-11, 02:01 PM
P: 8
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
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cupid.callin
#2
Jan20-11, 02:22 PM
P: 1,135
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
#3
Jan20-11, 02:28 PM
P: 8
Quote Quote by cupid.callin View Post
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
#4
Jan20-11, 02:33 PM
P: 1,135
Coulomb's law

yes
because C will push A along -X and B will attract A along +X
mimictt
#5
Jan20-11, 05:50 PM
P: 8
Quote Quote by cupid.callin View Post
yes
because C will push A along -X and B will attract A along +X
THank you so much!


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