PRACTICAL TECHNIQUES & KNOW-HOW FOR MAKING & MEASURING IN THE LABORATORY & WORKSHOP

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Measuring the Magnetic Field Strength at the pole of a magnet.

The calibrated gaussmeter was used to measure the magnetic field of a ceramic magnet. This was approximately 6mm in diameter and 10mm in length and, as the results below indicate, produce a field of about 0.3 Tesla at the pole face. The field falls much more quickly than the inverse square law would predict, and the curve is best approximated to a polynomial for empirical purposes.

distance d mmVgaussVgaussLateral Collinear
 (lateral)collinearField TeslaField Tesla
01.16E+002.30E+001.68E-013.33E-01
19.50E-011.80E+001.38E-012.61E-01
27.50E-011.30E+001.09E-011.88E-01
44.80E-017.70E-016.96E-021.12E-01
63.10E-014.50E-014.49E-026.52E-02
81.88E-012.89E-012.72E-024.19E-02
101.34E-011.87E-011.94E-022.71E-02
154.90E-029.20E-027.10E-031.33E-02
202.70E-025.40E-023.91E-037.83E-03
251.22E-023.15E-021.77E-034.57E-03
307.50E-032.20E-021.09E-033.19E-03
355.00E-031.40E-027.25E-042.03E-03
403.20E-031.10E-024.64E-041.59E-03
502.00E-037.00E-032.90E-041.01E-03
756.00E-043.30E-038.70E-054.78E-04
100 2.20E-03 3.19E-04