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PHYS 255b-004 PreLab - Faraday's Law

PHYS 255b-004 PreLab - Faraday's Law - 5 Click Start and...

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Faraday's Law Shannon Berg November 4, 2010 Physics 255b Section 4 Object The purpose of this experiment is to measure the induced voltage in a coil as a magnet is moved through the coil. Ultimately, Faraday's law, comparing "flux" induced on one end to the "flux" induced on the other end, determining area under the voltage versus time graph, and measuring the induced voltage as mentioned in the previous sentence will all be key learning objectives. Apparatus 1) PASPORT Voltage-Current Sensor 2) USB Link 3) AC/DC Electronics Laboratory 4) Bar Magnet Procedure 1) Place alligator clips on the leads of the Voltage-Current Sensor. 2) Attach a Voltage-Current Sensor lead to the component spring next to the coil and the other lead to the inductor coil on the circuit board. 3) Place the circuit board so that a magnet can fall freely when dropped through the coil and so the corner of the board with the coil is beyond the edge of the table. 4) Hold magnet with south end is 2 cm above the coil.
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Unformatted text preview: 5) Click Start and drop the magnet through the coil. 6) Data recording will stop after 0.5 seconds and start when the magnet falls through the coil and end when the voltage reaches 0.05 V. 7) Click Scale to Fit. 8) Select a region enclosing the first peak of the voltage plot and record the Area. 9) Repeat step 8 for the second peak. Theory Statement Because a magnetic field can be detected when electricity is passed through a conducting wire, Faraday suggested and experimented with measuring electricity, or the electromotive force (EMF), of a coil of conducting wire when passing a magnet through the coil. Therefore, by using Faraday's Law of Induction, =-ε N∆φ∆t where ε is the EMF, N is the number of coils, Δφ is the flux, and Δt is the change in time, and making a plot of EMF versus time, the area under the curve is found by integration and represents the flux. 1 2...
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PHYS 255b-004 PreLab - Faraday's Law - 5 Click Start and...

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