sin (16) 6.-24.68 a) What is potential difference? (3 marks) b) Sketch a diagram of electric field indicating the direction of the field lines and the direction that a negative charge would move in this field. (4 marks) Qxl- V c) If a charge of 3μC is placed in an electric field of 4 V, what is the change in electric potential energy of the charge? (3 marks) d) If 3mC moves through a circuit in a time of 0.25 s, what is the current flow? (3 marks) e) Currents as low as 100 mA can cause uneven and uncontrolled pumping in the heart. Is the current measured in (d) above sufficient for this to occur?