Observations of Induced Electromotive Force from a Permanent Magnet in Revolution: (the Curvature, Effect of Separation Distance, and Position of the Magnetic Poles)
Induced electromotive force (emf) which is detected from changes in the magnetic flux through the changes of solenoid area penetrated by magnetic field was reported at this final project. The equipment for this experiment consists of a set of disc rotor, permanent magnets, solenoids, and an oscillos...
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| Format: | Theses |
| Language: | Indonesia |
| Online Access: | https://digilib.itb.ac.id/gdl/view/20166 |
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| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | Induced electromotive force (emf) which is detected from changes in the magnetic flux through the changes of solenoid area penetrated by magnetic field was reported at this final project. The equipment for this experiment consists of a set of disc rotor, permanent magnets, solenoids, and an oscilloscope. In this experiment, the curvature of induced emf as a function of time on the oscilloscope consists of a hill-flat- valley shape related to the area of solenoid penetrated by magnetic field. Qualitatively magnetic field generated by a permanent magnet decreases exponentially with the distance away from the surface of the magnet. From this experiment that have been performed by varying the separation distance (d) between the permanent magnet and the solenoid (its length L =12 cm and number of windings N = 475), it was obtained mV. In addition, by varying the solenoid length (3, 6, 9, 12 and 15 cm) through the variation of winding number (115, 220, 320, 415 and 510) at a fixed distance to the magnet, it was obtained that Vpp of the induced electromotive force is not significantly different among the solenoids. This is plausible since at the distance d  3 cm the magnetic field it very weak. Using two solenoids where one of them has 3 times bigger in the number of winding, it was obtained that induced electromotive force is in accordance with Faraday-Lenz law. Determination of the magnetic poles is also conducted in this experiment using 6 compasses which placed around the permanent magnet so that the direction of the magnetic fields can be obtained and the magnetic poles can be determined. The result in this determination of the magnetic poles is in accordance with the prediction from the changes of magnetic flux through the changes of the phase of induced electromotive force when the position of the magnet is upside down and when there is a reversal oscilloscope probe connection. |
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