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PHY111 112-Electromagnetic Induction Lab report

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Electromagnetic Induction Lab Purpose: Experimentally observe how magnet polarity affects induced current in a wire loop Time: Approximately 30 minutes Question: How does magnet polarity affect the ... current flowing in a loop of wire? Hypothesis: If the polarity of a moving magnet is reversed, then the current induced in a loop of wire will reverse in direction, because magnet polarity determines the direction of the electromagnetic force. Variables: Independent Variable: magnet polarity Dependent Variable: induced current Constant: magnet strength Materials: Electronic device, Gizmo “Electromagnetic induction” simulation Procedures: Step 1: Open the simulation. a) Be sure to follow all the directions provided in the lab guide as well as on screen during the virtual lab. b) Open the Gizmo “Electromagnetic Induction,” and familiarize yourself with the controls. c) Locate the “Show magnetic field” checkbox and click it; magnetic field lines should be present around the magnet. d) Click on the “Show loop data” checkbox to select it. This will display current data that you will record in your table. e) Click on the “Oscillation” checkbox under the speed setting. This will allow the magnet to move back and forth without requiring manual operation, and allow for easier reading of maximum current levels. Step 2: Identify induced current when the magnet is in motion (magnetic polarity normal). a) In the “Magnet” control box in the lower right, be sure the speed is set to 10 cm/s, which is adjusted by using the slider. b) Click on the “Forward” radio button and observe the change of current value (I) in the wire loop box of the Gizmo. Current and magnetic flux will also be displayed graphically over the magnetic field lines. [Show More]

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