1. The electron and proton of a hydrogen atom are separated (on the average) by

Question

1. The electron and proton of a hydrogen atom are separated (on the average) by a distance of approximately 5.3 x10-11 m. Find the magnitude of the electric force. 10 pts



2. Two small beads having positive charges 3q and q are fixed at the opposite ends of a horizontal, insulating rod, extending from the origin to the point x =d. A third small charged bead is free to slide on the rod. At what position is the third bead in equilibrium, meaning the net force on the third small charge is equal to zero? 10 pts






3. Three point charges are aligned along the x axis as shown on the figure. Find the electric field at the point (2.00,0). The electric field E = Kq/d2 where q is the charge of the source point, K is the Coulomb constant and has the value of K= 8.99 x10 9 N*m2/C2. 10pts

Explanation / Answer

a) force = 9*10^9*(1.6*10^-19)^2 / (5.3*10^-11)^2 = 8.2*10^-8 N b)let the distance from the 3q charge be x so 3Kq/(x)^2 = Kq/(d-x)^2 x/(d-x) = sqrt(3) x = [d*sqrt(3)]/(sqrt(3)+1) from the 3q charge c)Figure is not given please give the figure.

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