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Construction and Calibration of a Watt Balance
Umeå University, Faculty of Science and Technology, Department of Physics.
2017 (English)Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
Abstract [en]

We build a calibration system for a Watt balance. The Watt balance uses the Lorentz force acting on a current-carrying coil attached to the weighing pan and placed in a radial magnetic field to balance the gravitational force acting on the measured object. To calibrate the balance, we determine the constant value BL (where B is the total magnetic flux through the coil and L is the total length of the wire around the coil) for the coil A and coil B installed under the weighing pans. We perform two modes of operation to measure BL: velocity mode by applying Faraday's law of induction, and force mode, using magnetic force acting on the coil carrying a current and a set of reference masses.

We find that BL from the velocity mode for coil A is 4.2±0.2 [(Vs)/m] and 3.9±0.1 [(Vs)/m] for coil B, while from force mode, BL is 3.91±0.04 [(Vs)/m] for coil A and 3.42±0.04 [(Vs)/m] for coil B. Considering the error from reference masses, we use the results of the velocity mode as the most accurate value of BL for the coils.

Place, publisher, year, edition, pages
2017.
National Category
Atom and Molecular Physics and Optics
Identifiers
URN: urn:nbn:se:umu:diva-142042OAI: oai:DiVA.org:umu-142042DiVA, id: diva2:1158017
Subject / course
Fysik C - Examensarbete
Available from: 2017-11-17 Created: 2017-11-17 Last updated: 2017-11-17Bibliographically approved

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