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Download Electricity and Magnetism
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Electricity and Magnetism Moving Charges and Magnetic Fields • Moving charges produce magnetic fields • Magnetic field lines form circles around a wire • The direction of the field reverses as the current reverses Electromagnets • A temporary magnet made by wrapping a wire coil carrying a current around an iron core • Solenoid wire wrapped into a cylindrical coil Speakers • Contains an electromagnet connected to a flexible speaker cone made of paper, plastic, or metal Electrical Energy Mechanical Energy Vibrates Speaker Cone Produces Sound How A Speaker Is Made • Speaker Video
