Assessment Questions 1-4 Magnetic review http://www.youtube.com/watch?v=uj0DFDfQajw&NR =1&feature=fvwp 1. Besides a magnet what can produce a magnetic field? A moving electric charge can create a magnetic field = electricity flowing through a wire. LT#2 We use moving magnets to generate an electric current & we use electric current to make magnets. http://www.youtube.com/watch?v=9Zy0VHBXxL U&annotation_id=annotation_397286&feature=iv 2. How is the magnetic field of an electromagnet controlled? It can be turned on and off LT#2 http://www.youtube.com/watch?v=UBiKruVV3a0 It’s strength and direction can be controlled by controlling the current. http://www.ehow.co.uk/video_4951982_doelectromagnets-work_.html 3. How are solenoids and electromagnets used in galvanometers, electric motors and loudspeakers? They all change electrical energy into mechanical energy. LT#1 http://www.youtube.com/watch?v=e5434dDB-7w http://www.youtube.com/watch?v=it_Z7NdKgmY&fea ture=PlayList&p=305357ACC216006C&playnext_from= PL Galvanometers detect electric current A magnet and a wire coil are used to measure a magnetic field caused by current. Moving a magnet through the coil will deflect the galvanometer = generator effect. LT#3 4. How does a ferromagnetic rod inside a solenoid affect the strength of an electromagnet? LT#2 The rod makes the magnetic field much stronger. When current flows through the coil, it creates a magnetic field that magnetizes the ferromagnetic rod.