Question

A positive charge of 5.10 C is fixed in place. From a distance of 3.70 cm a particle of mass 6.80 g and charge +2.60 C is fired with an initial speed of 70.0 m/s directly toward the fixed charge. How close to the fixed charge does the particle get before it comes to rest and starts traveling away?

Answer 1

Particle 1 carrying -4.0 μC of charge is fixed at the origin of an xy coordinate system, particle 2 carrying +8.0 μC of charge is located on the x axis at x = 4.0 m , and particle 3, identical to particle 2, is located on the x axis at x = -4.0 m .
What is the vector sum of the electric forces exerted on particle 3? Determine the x and y components of the vector sum.
Express your answers separated by a comma.