Revision: Electromagnetism Report a question What's wrong with this question? You cannot submit an empty report. Please add some details. 19 Electromagnetism - Revision Quiz Test your understanding of Electromagnetism here: 1 / 5 1) 2018 S4 EOY P1 Q27 The diagram below shows the cross-section of 4 wires. The wires are long and run parallel to each other. Two of the wires have current going into the page and two have current coming out of the page. The magnitude of the currents in all four wires is the same. What is the direction of the magnetic field at P? (Ignore the Earth's magnetic field.) To the left To the right Downwards Upwards 2 / 5 2) Which of the following changes to a d.c. motor will not increase the speed of rotation of the motor? Replace the copper wire of the coil with iron wire. Use of a soft iron core. Increase the number of windings in the coil. Use stronger magnets. 3 / 5 3) 2010 S4 EOY P1 Q27 In the following diagram, a compass is placed above a current-carrying wire and it is close to a magnet. The Earth's magnetic field may be ignored. If the current flows towards the right, which of the following diagrams shows the direction of the compass needle? ""*;N;}} 4 / 5 4) 2011 S4 EOY P1 Q25 The diagram below shows a simple electric motor which has a rectangular coil that is linked to a power supply. The rectangular coil rotates when it is mounted between two magnetic poles N and S. Which statement is true? The coil rotates clockwise and comes to rest in a vertical position when a direct current flows through the coil from X to Y. The coil moves downwards when a direct current flows through the coil from X to Y. The coil rotates anticlockwise when a direct current flows through the coil from X to Y. The coil rotates continuously clockwise when an alternating current flows through the coil. 5 / 5 5) The diagram shows a simple d.c. motor. The coil rotates clockwise about the axis PQ. Which of the following correctly indicates the direction of current flow in the coil (top view) and the given poles of the magnets X and Y, in the motor? Polarity of magnet poles: X is north and Y is south Direction of current flow round the coil: clockwise Polarity of magnet poles: X is south and Y is north Direction of current flow round the coil: alternating current Polarity of magnet poles: X is north and Y is south Direction of current flow round the coil: anticlockwise Polarity of magnet poles: X is south and Y is north Direction of current flow round the coil: anticlockwise Your score is Restart quiz
