1. Determine the magnitude of the electric force between two charges of 1.00 x 10-5C and 1.00 x 10-6C that are separated by a distance of 3.00 m. (p-332) 2. An electric force with a magnitude of 2.5 N, directed to the left, acts on a negative charge of -6.0 C. (p-337) (a) Determine the electric field in which the charge is located. (b) Calculate the electric field when the force is the same but the charge is -0.85 C. 3. An electron enters a uniform electric field of 135 N/C pointed toward the right. The point of entry is 2.5 m to the right of a given mark, and the point where the electron leaves the field is 3.5 m to the right of that mark. (a) Determine the change in the electric potential energy of the electron. (b) The initial speed of the electron was 1.6 x 10' m/s when it entered the electric field. Determine its final speed. 4. A 155 mm part of a wire has a mass of 0.35 kg and carries an electric current of 4.5 A. The conventional current passes through a uniform magnetic field of 2.6 T. The direction of the wire and the magnetic field are shown in Figure 7. (a) What is the magnitude of the magnetic force on the wire? (b) Use the right-hand rule to determine the direction of the magnetic force