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Course: PHY 110, Fall 2008
School: American...
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Trask Jeffrey Section A Lab 10: Electromagnetic Induction Purpose: The purpose of this lab is to become familiar with the character of electromagnetic induction through the use of a galvanometer, magnets, and coils. Abstract: Electromagnetic induction, defined as the production of voltage across a conductor, either by moving through a magnetic field or by having a magnetic field through it. Magnetic fields, which...

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Trask Jeffrey Section A Lab 10: Electromagnetic Induction Purpose: The purpose of this lab is to become familiar with the character of electromagnetic induction through the use of a galvanometer, magnets, and coils. Abstract: Electromagnetic induction, defined as the production of voltage across a conductor, either by moving through a magnetic field or by having a magnetic field through it. Magnetic fields, which are produced by magnetized objects, produce a current when moved through an electric field, such as an energized conductor. We illustrated this using a metal coil hooked up to a galvanometer and magnets. When the conductor is energized but there is no magnetic field moving (moving being the key term) along it, the magnetic field will be stable and without current. When the magnetic field is moved, it creates a current which increases as the speed the magnetic field does. The magnetic field can be facing either way (north or south) and will still produce the same amount of current when moved, the only difference is that the needle on the galvanometer will swing the other way to begin. When a similar coil setup placed is next to the original and hooked up to an electrical switch, the galvanometer on the original coil will show a small amount of current when the switch is turned on or off, about 10 microamperes. When an iron rod is inserted into the coils, connecting the two, the galvanometer shows a large increase in current, and the rod is actually forced partially out of the coils because of the magnetic field produced by the electrical field. Next, we hooked up a 6-volt transformer to one coil and an AC milliammeter to the other and placed them next to each other to determine how many milliamperes would be produced from the alternating current, an automatically changing electrical field. When the coils are next to each other, 29.1 milliamperes were registered on the second coil, which quickly reduces when the coils are moved away from each other. With an iron core in the powered coil, the current registered is higher, at 36.2 milliamperes and still decreases when moved away from the other coil. The coil produces more of a current with the addition of the iron core because iron is a very good conductor of electricity.
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