Revision: Electromagnetic Induction Report a question What's wrong with this question? You cannot submit an empty report. Please add some details. 20 Electromagnetic Induction - Revision Quiz Test your understanding of Electromagnetic Induction here: 1 / 5 1) 2016 S4 EOY P1 Q26 A loop of wire in the form of a 2.0 cm square is moved through a uniform magnetic field at a constant speedas shown below. You may assume the magnetic field exists only in the region between the north and south poles. The current flowing through the loop is measured by a micro-ammeter (µA). Initially, the loop is placed well outside of the magnetic field and the micro-ammeter shows that no current is flowing through the loop. The figure below shows an end-on view of the loop as it passes across the face of the north pole of the magnet at a constant speed. A B C D 2 / 5 2) In some countries, electrical power is transmitted over a distance using overhead cables. Why is electrical power transmitted at high voltage using these cables? There is less energy loss. This will result in a larger current flowing in the cables. Electrical contact with high voltage cable is less dangerous. Electrical energy can travel faster along the cables. 3 / 5 3) 2014 S4 EOY P1 Q29 The diagram shows a transformer connected to an a.c. source. Which of the following statements is false? There is alternating current flowing in the secondary coil. The e.m.f. across the secondary coil is greater than the applied e.m.f. across the primary coil. The transformer is a step-down transformer. The current in the secondary coil is less than the current in the primary coil. 4 / 5 4) One pole of a magnet is moved towards the end X of a solenoid as shown below. The galvanometer shows a current being produced. The solenoid is replaced with one wound in the opposite direction as shown below and the same pole of the magnet moved towards the end Yof the solenoid. Which of the following statements is always true? The polarity of X is the same as the polarity of Y. A negative galvanometer reading would mean that end X is a south pole. The polarity of X is north. The galvanometer needle will deflect in the same direction both times. 5 / 5 5) 2015 S4 EOY P1 Q28 The diagram shows an a.c. generator. Which of the following changes will increase the magnitude of the alternating voltage output without changing its frequency? (i) Increase the speed of rotation of the rectangular coil about the axis XY. (ii) Increase the number of turns in the rectangular coil. (iii) Use stronger permanent magnets. (iv) Wind the rectangular coil around a copper core. (ii) and (iii) only (i) and (iii) only (ii), (iii) and (iv) only (i), (ii) and (iii) only Your score is Restart quiz
