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16- Small Fields

16- Small Fields. 16. Small Fields Construct a device based on a compass needle to measure the Earth`s Magnetic Field. By Aron Alexandre Heleodoro. 16- Small Fields. Introduction. The importance. Superficial. Exterior Field (Van Allen Belt). How to measure it.

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16- Small Fields

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  1. 16- Small Fields 16. Small Fields Construct a device based on a compass needle to measure the Earth`s Magnetic Field. By Aron Alexandre Heleodoro

  2. 16- Small Fields Introduction • The importance • Superficial • Exterior Field (Van Allen Belt) • How to measure it • Using the magnetic needle deviation • Using the charge deviation • Using a rotating coil

  3. 16- Small Fields The Method • Mathematical Model • Vectorial sum of two fields • #1: Earth’s Magnetic Field • #2: A field of known intensity and direction • Biot-Savart Law • Intensity and direction the magnetic field in a coil • Linear relation between the current in a coil and the tangent of the deflection angle. • Practice • Electric Circuit • Data acquisition (current and deflection angle) • Linear regression • Final value of the Earth’s magnetic field

  4. 16- Small Fields The Method

  5. I q 16- Small Fields Development - Theory • Deviation • Biot-Savart Law • Linear Relation • Inclination • Total Field

  6. 16- Small Fields Development - Experiment 1 DC source 0-12V 1 rheostat 1 coil with 90 turns 1 ampere meter 1 magnetic needle • Materials • Set up • CollectedData

  7. 16- Small Fields Development - Experiment • Photos • Video

  8. 16- Small Fields Development - Data Analysis • Tables • Graphics • Final Result

  9. 16- Small Fields Experiment - Error Sources • Other Magnetic Sources and interference in the Net Field • The Geometry of the model • Magnetic needle is an extensive body • Geometric center of the coil • Imprecisions in the measurement of the angle and current • Friction in the magnetic needle • Parallaxes

  10. 16- Small Fields Conclusion • Comparison with a theoretical value • Good theoretical model

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