i meed to solve this but dont know the material as i was absent. i need solutions with step by step. PLEASE NO CURSIVE WRITING

Problem 1 Consider the system formed by a 10nC point charge at the origin, and another 10nC charge at the point r - pet along the ar-axis. Assume both charges are held fixed throughout. (a)What is the total energy of the two charge system? (b)A third 10nC charge with mass 0.05g is released from the point : = 10cm also on the 7-axis. What is the electric potential at the point the charge is released, if the potential at infinity is zero? (c)After a long time the charge is far from the origin. What is the final velocity of the charge? I Problem 2 The figure shows three conducting spheres connected by conduct- ing wires. (a) Compare the electric potentials at the surfaces of the spheres (b) Compare the electric fields at the surfaces of the spheres. (b) (c) Problem 3 A parallel-plate capacitor with constant plate separation and area is initially filled with air. Its plates are charged to a certain amount by a battery, and then the capacitor is removed from the battery. (a)if the capacitor is then filled with a dielectric with dielectric constant