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) 2017 S4 EOY P1 Q26 The diagram below, half of a circular coil is inside a uniform magnetic field. PQ and RS are two perpendicular diameters of the circular coil. Which of the following movements will in induce a current to flow clockwise in the coil? Pull the coil in the direction P. Pull the coil in the direction Q. Pull the coil in the direction R. Pull the coil in the direction S. Use Fleming's Right Hand Rule 2 / 5 2) Coil P is connected to a sensitive centre-zero galvanometer. Another coil Q is connected to a battery, a variable resistor and a switch S as shown. Initially the resistance of the variable resistor is set to the highest value. The switch S is closed and the resistance of the variable resistor is gradually decreased to a minimum. Finally, the switch S is opened. The deflection of the galvanometer is maximum at the instant the switch S is opened. when a small steady current is flowing in Q. when the steady current is Q is maximum. at the instant the switch S is closed. 3 / 5 3) An ideal transformer that is used to operate a 5.0 A, 800 V machine has 200 turns and 500 turns in its primary and secondary coils respectively. What are the current and voltage delivered by the alternating power source that is connected to the transformer? 12.5 A at 320 V 2.0 A at 2000 V 2.0 A at 320 V 12.5 A at 2000 V 4 / 5 4) 2014 S4 EOY P1 Q29 The diagram shows a transformer connected to an a.c. source. Which of the following statements is false? The transformer is a step-down transformer. The current in the secondary coil is less than the current in the primary coil. 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. 5 / 5 5) 2018 S4 EOY P1 Q30 The diagram below shows two different power transmission systems, X and Y, which transmit power to a heater with rating ‚"220 V, 484 W". The total resistance of the transmission cables in both systems are 10 Ω. In system Y, assume there is no power loss in the transformers and in the circuits P and Q. What is the ratio of the power loss in transmitting power in system X to that in system Y? 10:1 20:1 25:1 15:1 Your score is Restart quiz
