1. Two metal plates have a voltage drop of magnitude 50 V between the plates. If the spacing between the plates is 15 cm, what is the magnitude of the electric field between the plates?

2. A 5 mC point charge is 3 m from a second point charge, the force each one experiences a force of 0.005 N. What is the magnitude of the second charge?

3. Two point charges are placed 6 cm apart from one another. The charge to the left is -50 nC, and the charge to the right is known to be positive, but its magnitude is unknown. If the net electric field midway between the charges is zero, what is the magnitude of the charge to the right?

4. How much work is needed to carry a proton from the positive terminal to the negative terminal of a 12 V battery?

5. Two point charges each experience a 27 N electrostatic force when they are a distance dfrom one another. If they are moved to a new separation of 3d, what is the magnitude of the electric force on each of them?

6. Two 10 C charges are placed 5 m apart from each other. What is the electric potential (relative to infinity) midway between the two charges?

7. The electric field at a point 1.3 cm from a small object points toward the object with a strength of 5000 N/C. What is the object's charge q?

8. A proton moves 30 cm along the direction of an electric field of magnitude 20 V/m. What is the change in kinetic energy of the proton?

9. A 4 m by 4 m square has point charges of +2 C and -2 C placed in two diagonally opposite corners. In the other two corners are placed charges of +7 C and -7 C. What is the electric potential at the midpoint of the square?

10. An electron is placed in an electric field of strength 0.5 N/C. The field is uniform and points to the left. What are the magnitude and direction of the acceleration of the proton due to this field?