GCSE Science Fold Solve Electromagnetism Fold the answers

GCSE Science Fold & Solve – Electromagnetism Fold the answers and work through the questions below. 1 AO 1. 2. Name 2 responses when the poles of magnets are placed next to each other. What are the names of the poles on a bar magnet? 3. Name one material the core of an electromagnet needs to be made from. 4. Name 1 way that you can increase force of an electric motor. 5. 6. What piece of equipment is needed to draw a magnetic field? 2 AO 1. 2. The student gives the steel ball bearing a gentle push in the direction of the iron rod. At the same time the student closes the switch S. Explain the effect on the motion of the ball bearing when the switch S is closed. One of the coils has a p. d. of 25 k. V across it and has 1000 turns. The other coil has a p. d. of 400 k. V across it. Calculate the number of turns on this other coil. 3 AO What is the magnetic field of? 1. Suggest two changes to the device: a) each one of which would make the coil spin faster. b) each one of which would make the coil spin in the opposite direction. Answers – Fold this over! AO 1 1. Attract/Repel 2. North/South 3. Iron/Steel/Nickel/Cobalt 4. Increase the strength of the magnet/increase p. d. 5. Plotting compass 6. Bar magnet. AO 2 1. Njbv • Current is in the coil when S is closed. • Magnetic field is created. • Force of attraction on ball bearing. • So it accelerates towards the rod. 2. • 400 ÷ 25 = 1000 ÷ n • 16 = 1000 ÷ n • n = 16000 AO 3 1 a) • More powerful magnet • Increase the area of coil. • More powerful cell. • More turns 1 b) • Reverse the polarity of the cell. • Reverse the polarity of the magnet.