Physics
posted by Phil .
Figure (a) shows charged particles 1 and 2 that are fixed in place on an x axis. Particle 1 has a charge with a magnitude of q1 = 12.0e. Particle 3 of charge q3 = +13.0e is initially on the x axis near particle 2. Then particle 3 is gradually moved in the positive direction of the x axis. As a result, the magnitude of the net electrostatic force on particle 2 due to particles 1 and 3 changes.
Figure (b) gives the x component of that net force as a function of the position x of particle 3. The scale of the x axis is set by xs = 1.70 m. The plot has an asymptote of F2,net = 1.370 × 1025 N as x → ∞.
As a multiple of e and including the sign, what is the charge q2 of particle 2?
Here are the two figures:
h t t p : / / i . i m g u r . c o m / I U C 3 6 . p n g

As x> infinity, it no longer affects the force on particle 2, F2.
Use the value of F2 when x = infinity, the fixed distance separation of 1 and 2, and Coulomb's equation to determine the charge of particle 2. 
As above, as the xvalue for particle 3 approaches infinity the only force acting on particle 2 is from particle 1. The asymptote is the value of that force. Set the equation for (kq1q2)/(r^2) = 1.370e25N and solve for q2.
Note that you can solve for r with the knowledge that the Fnet provided is the constant force from q1 onto q2 and that the net force is 0 at the xvalue where the graph crosses the x axis.
Respond to this Question
Similar Questions

Physics  please help!
Particles 1 and 2 of charge q1 = q2 = +3.20 x 1019 C are on a y axis at distance d = 22.0 cm from the origin. Particle 3 of charge q3 = +9.60 x 1019 C is moved gradually along the x axis from x = 0 to x = +5.0 m. At what value of … 
Physics
Figure (a) shows charged particles 1 and 2 that are fixed in place on an x axis. Particle 1 has a charge with a magnitude of q1 = 12.0e. Particle 3 of charge q3 = +13.0e is initially on the x axis near particle 2. Then particle 3 … 
Physics
Three charged particles form a triangle: particle 1 with charge Q1 = 84.0 nC is at xy coordinates (0, 4.60 mm), particle 2 with charge Q2 is at (0, 4.60 mm), and particle 3 with charge q = 40.0 nC is at (6.40 mm, 0). What are the … 
College Physics
particle 1 of charge q1 = 1.04 ìC and particle 2 of charge q2 = 2.99 ìC, are held at separation L = 10.8 cm on an x axis. If particle 3 of unknown charge q3 is to be located such that the net electrostatic force on it from particles … 
College Physics
Two particles are fixed to an x axis: particle 1 of charge 7.93 x 107 C is at the origin and particle 2 of charge +7.93 x 107 C is at x = 14.6 cm. Midway between the particles, what is the magnitude of the net electric field? 
College Physics
Two particles are fixed to an x axis: particle 1 of charge q1 = 2.22 x 108 C at x = 15.6 cm and particle 2 of charge q2 = 4.33q1 at x = 66.7 cm. At what coordinate on the x axis is the electric field produced by the particles equal … 
physics
Two particles are fixed on an x axis. Particle 1 of charge 47.9 μC is located at x = 5.87 cm; particle 2 of charge Q is located at x = 32.3 cm. Particle 3 of charge magnitude 52.8 μC is released from rest on the y axis at … 
physics
One particle has a mass of 2.86 x 103 kg and a charge of +7.32 μC. A second particle has a mass of 6.41 x 103 kg and the same charge. The two particles are initially held in place and then released. The particles fly apart, … 
Physics
Two particles are fixed to an x axis: particle 1 of charge q1 = 1.73 ¡Ñ 108 C at x = 30.0 cm and particle 2 of charge q2 = 4.41q1 at x = 78.0 cm. At what coordinate on the x axis is the electric field produced by the particles … 
Physics
Two particles are fixed on an x axis. Particle 1 of charge 70.5 μC is located at x = 28.5 cm; particle 2 of charge Q is located at x = 21.2 cm. Particle 3 of charge magnitude 37.4 μC is released from rest on the y axis at y = 28.5 …