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 Q25 The diagram below shows a step down transformer. The lamp glows dimly. Which of the following changes would cause the lamp to glow more brightly? Replace the soft-iron core with a copper core. Remove portion X of the soft-iron core. Replace the primary and secondary coil with thinner wires. Decrease the number of turns on the primary coil. 2 / 5 2) 2012 S4 FA P1 Q28 A conducting wire induces an e.m.f. of 1.0 mV when it cuts perpendicularly through a region of magnetic field at a speed of 2.0 m s-1 as shown. What would be the expected voltmeter reading when the speed increases to 8.0 m s-1? 2.0 mV 1.0 mV 8.0 mV 4.0 mV 3 / 5 3) 2015 S4 EOY P1 Q27 A bar magnet drops vertically through a horizontal loop of copper wire as shown in the diagram. The loop of wire is viewed from above at the position X. Which of the following statements is correct? The induced current in the loop of wire will first flow in a clockwise direction then in an anticlockwise direction. The induced current in the loop of wire will flow in a clockwise direction. The induced current in the loop of wire will first flow in an anticlockwise direction then in a clockwise direction. The induced current in the loop of wire will flow in an anticlockwise direction. 4 / 5 4) 2018 S4 EOY P1 Q29 The following is a voltage-time graph of a simple a.c. generator. Which graph is correct if the coil of the generator now has twice the number of loops as the original one? 5 / 5 5) A bar magnet is pushed towardsa solenoid PQ as shown below. Which of the following statements correctly describes the pole induced at Q and the direction of current flow through the galvanometer G? Pole induced at Q: north Direction of current through G: right to left Pole induced at Q: south Direction of current through G: right to left Pole induced at Q: north Direction of current through G: left to right Pole induced at Q: south Direction of current through G: left to right Your score is Restart quiz
