1) In the figure below, the work done by the electrostatic force as the test charge (q0 = 2 μC) moves from A to B is WAB = 5x10-5 J. Find the difference in the electric potential energies of the charge between these points and the potential difference εV between the points.
2) The capacitance of an empty capacitor is 1.2 μF. The capacitor is connected to a 12 V battery and charged up. It is then connected to a second capacitor of capacitance C. The final voltage of both capacitors is 6 V. What was the capacitance C?
3) A spark plug in a car engine consists of two metal conductors that are separated by a distance of 0.75 mm. When an electric spark jumps between them, the magnitude of the electric field is 4.7 x 107 V/m. What is the magnitude of the potential difference εV between the conductors?