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Purpose

Purpose. Study the induction of electric current according to Faraday’s Law. Faraday’s Law. Change in the magnetic flux through the loop. Time interval over which the flux change occurs. Induced electromotive Force (“voltage”). Magnetic Flux Through a Loop of Wire. Cross sectional area

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Purpose

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Presentation Transcript

  1. Purpose • Study the induction of electric current according to Faraday’s Law.

  2. Faraday’s Law Change in the magnetic flux through the loop Time interval over which the flux change occurs. Induced electromotive Force (“voltage”)

  3. Magnetic Flux Through a Loop of Wire Cross sectional area of the loop B

  4. e An Example of Induced Voltage B B e Time it took to rotate coil by 90: Dt

  5. Activity 1: Flux Change by Moving Magnet Plug LED connector into 2000 turn detector coil LED light turns green or red, depending on the polarity of the voltage. LED

  6. Activity 1: Flux Change by Moving Magnet Move cow magnet EXTREMELYQUICKLY in and out of the detector coil. Watch color of LED during movement. Cow magnet

  7. Activity 2: Flux Change Using Function Generator Function Generator 200 turn field coil: Called “field” coil because it is used to generate a magnetic field by running current through it. An alternating current (from function generator) creates an alternating magnetic field by this coil.

  8. Activity 2: Flux Change Using Function Generator: Setup Ch 2: Monitors the voltage induced in the detector coil. Ch 1: Monitors signal from signal generator (and thus the B-field generated by the field coil). Don’t use middle connector Signal generator output Now you can compare these two on the two oscilloscope channels “Banana” cables BNC to Banana adapter BNC T-piece

  9. Activity 3: Replacing Field Coil with Small Coil Signal generator output

  10. Activity 4: Flux Change by Moving Magnet, Observed with Oscilloscope Similar to Activity 1, but also monitor voltage with Ch. 1 of oscilloscope. Set timescale to 500ms, vertical scale as needed. Plug both BNC cable and LED into the detector coil

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