Two point charges q1= 1.25 nC and q2= 4.50 nC with masses of = 3.00 µg and = 1.00 µg respectively, are both initially being held at rest separated by a distance of 0.155 cm. Charge is then released and the electrostatic force of repulsion started pushing it in the direction opposite that of which remains stationary. When they are separated by 0.225 cm, the speed of is most nearly.

Two point charges q1 and q2 are held in place 4.50 cm apart. Another point charge -1.95 μC of mass 5.50 gg is initially located 3.00 cm from each of these charges (the figure(Figure 1)) and released from rest. You observe that the initial acceleration of -1.95 μC is 314 m/s^2 upward, parallel to the line connecting the two point charges.

A 28 x 10-6 C point charge is held at rest within a uniform electric field of 840.0 N/C directed in the +x direction. If the charge is released from rest, what will its speed be after moving 0.73 m in the +x direction. Assume only the electric field force acts and that the mass of the charge is 3.00 x 10-7 kg.

Two hard rubber spheres, each of mass m = 16.3 g, are rubbed with fur on a dry day and are then suspended with two insulating strings of length L = 5.50 cm whose support points are a distance d = 3.21 cm from each other as shown in the figure below. During the rubbing process, one sphere receives exactly twice the charge of the other. They are observed to hang at equilibrium, each at an angle of ? = 10.9° with the vertical. Find the amount of charge on each sphere. (Assume the two spheres have charges q1 and q2 = 2q1)