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Quantum Fizzics
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Homework Statement
Two small spheres with charges 1.6*10^-5 C & 6.4*10^-5 C, are 2.0m apart. The charges have the same sign. Where, relative to these two spheres, should a third sphere, of opposite charge 3.0*10^-6 C, be placed if the third sphere is to experience no net electrical force? Do we really need to know the charge or sign of the third object?
Given: q1 =1.6*10^-5 C
q2 = 6.4*10^-5 C
q3 = 3.0*10^-6 C
Homework Equations
F= kq1q2/d^2
The Attempt at a Solution
F31 = kq3q1/d^2
= 9x10^9*3.0x10^-6*1.6x10^-5/d^2
9x10^9*3.0x10^-6*1.6x10^-5 = d^2
0.657267069m= d
What I want to know is how will I know? If this will be the right distance where the 3rd sphere won't experience no net electrical force? That is the answer well ( 0.67m ) & yeah, because honestly we never learned this stuff in terms of coulombs law but I know that its the same as Newtons Law also I just got to substitute some variables & such. An explanation would be great, thanks ( I got a quiz tomorrow so)