What is the net force exerted by these two charges on a third charge q3 = 45.5 n

Question

What is the net force exerted by these two charges on a third charge q3 = 45.5 nC placed between q1 and q2 at x3 = -1.205 m ?

Your answer may be positive or negative, depending on the direction of the force.



Coulomb's law for the magnitude of the force F between two particles with charges Q and Q' separated by a distance d is

|F| = k|Q*Q'|/d^2

where k =8.854 *10^-12 C^2/(N*m^2) . is the permittivity of free space.

Consider two point charges located on the x axis: one charge, q1 = -17.5 nC , is located at x1 = -1.670 m ; the second charge, q2 = 32.0 , is at the origin .

find force on q^3 :

Explanation / Answer

Fnet = 9*10^9*45.5*10^-9*(32*10^-9/1.205^2 + 17.5*10^-9/(1.67-1.205)^2) = 4.22*10^-5 N

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