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ELECTROMAGNETISM The interaction between electricity and magnetism Definition: Electromagnet a coil of current-carrying wire that acts as a magnet that can be turned on and off. Definition: Solenoid a current-carrying coil of wire with many loops. SOLENOIDS When a solenoid is turned on, a magnetic field is created. If a piece of iron or other ferromagnetic material is wrapped by the coils of wire in a solenoid, a magnet is created when the current is turned on. Strength of ELECTROMAGNETS The strength of an electromagnet can be increased by: 1. Increasing the electric current in the solenoid 2. Increasing the number of coil loops around the ferromagnetic material 3. Using a stronger ferromagnetic material (more iron content) Using a stronger ferromagnetic material (more iron content) Increasing the number of coil loops around the ferromagnetic material Increasing the electric current in the solenoid (more voltage) Examples of Electromagnet Uses A doorbell or an alarm Moving junk cars Recording data on your computer Reading the magnetic strip on the back of a credit card Electric motors Magnetic Forces vs. Electrical Forces Electromagnetism - interaction between electricity and magnetism a) Magnetic forces arise from the movement of electrical charge. b) Electrical forces arise from the movement of a magnet (induced current) *Get a post-it-note *Put your name on it *Answer the question below: What 3 factors can make an electromagnet stronger?