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Magnetism ppt Notes In 1831, __________________________________ discovered that a momentary current existed in a circuit when the current in a nearby circuit was started or stopped Oersted showed that magnetic effects could be produced by ____________________________________; Faraday and Henry showed that electric currents could be produced by moving _____________________ All magnetic phenomena result from forces between _________________ charges in motion. There are __________________ and _____________________ on every magnet. Like poles repel, unlike poles _______________. ____________________ forces attract only magnetic materials. Magnetic forces act at a ______________. While magnetized, _________________________ magnets act like permanent magnets. A ________________________with an electric current flowing through it becomes a magnet. Putting iron inside a current-carrying coil increases the __________________ of the electromagnet. A changing magnetic field induces an electric current in a ____________________. A charged particle experiences no magnetic force when moving parallel to a magnetic field, but when it is moving perpendicular to the field it experiences a ___________ perpendicular to both the field and the direction of motion. A current-carrying wire in a perpendicular magnetic field experiences a force in a direction perpendicular to both the ___________ and the ________________. Magnetic field lines describe the structure of magnetic fields in _____ dimensions. Field lines _______________ where the magnetic force is strong, and ____________ where it is weak. An ________________________ is a machine which converts electrical energy into mechanical (rotational or kinetic) energy.