e) Once in orbit, how much additional energy would the satellite require to escape from Earth's potential well? [2 marks] 16. An oil drop of mass 4.7 x 10 15 kg is suspended between two parallel plates as shown below. 0.50 cm O 120 V a) Calculate the charge on the oil drop. [3 marks] b) Calculate the number of elementary charges required to make up this charge. [2 marks] c) Does the oil drop have a deficit or excess of electrons? Explain. [2 marks]