FREE RESPONSE QUESTIONS 1. A fixed horizontal coil is connected to an ideal voltmeter. A bar magnet is released from rest so that it falls vertically through the coil along the central axis of the coil. The variation with time t of the emf induced in the coil is shown. induced emf / my xmax flux bar magnet coal voltmeter -2- - 3- -4- - 5- a [1 mark] Write down the maximum magnitude of the rate of change of flux linked with the coil. ( HAT * 10 !) b. [1 mark] State the fundamental SI unit for your answer to (a). c. [3 marks] Explain why the graph becomes negative. d. [2 marks] Part of the graph is above the t-axis and part is below. Outline why the areas between the t-axis and the curve for these two parts are likely to be the same. e. [3 marks] Predict the changes to the graph when the magnet is dropped from a lower height above the coil