Question 4 (8 marks) Draw an arrow on the coil in Figure 3b to show the direction of the induced current in the Figure 3a shows a square coil of area 0.020 m" and 100 turns placed between the poles of two magnets. 3 marks b. coil as the magnets are pulled away. Provide an explanation to justify your answer. The size of the magnetic field at the area of the coil is 0.50 T. Figure 3b shows the two magnets pulled sufficiently far apart such that the resulting magnetic field at the position of the coil is O T. N S slip rings oscilloscope Figure 3a C. The magnets are returned to the initial position shown in Figure 3a. They are moved from the position of Figure 3a to that of Figure 3b, then returned to Figure 3a without any pause. N This movement is repeated once more. Each change of position takes 0.10 seconds. At all times, the magnets maintain a constant speed relative to each other. The position of the coil at t = 0 is shown in Figure 3a. slip rings On the axes provided below, sketch the output signal that would be displayed on the oscilloscope datalogger over the 0.40 seconds of movement. (A scale on the y-axis is not required.) oscilloscope 2 marks Figure 3b V (volts) In both figures, the ends of the coil are connected to two slip rings that are connected to an oscilloscope datalogger. The time taken to pull the magnets from the position in Figure 3a to the position in Figure 3b is 0.10 seconds. a. Calculate the magnitude of the average EMF induced in the coil as the magnets move from their positions in Figure 3a to their positions in Figure 3b. Show your working. 3 marks 0.00 0.05 0.10 0.15 0.20 0.25 0.30 0.35 t (seconds) 0.40