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From these measured values, the charge-to-mass ratio of the electron is calculated: Using PASCO Capstone to Graph Data and Develop Mathematical Models 1. The magnetic field (B) deflects the electron beam in a circular path with a radius (r) that is measured using the illuminated mm scale. Go to and enter Materials Testing System in the Search window.

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A measured accelerating potential (V) is then applied to the electron gun. PASCO Capstone was designed to be the most powerful software available for high level physics and engineering applications or for anyone who wants the advanced capabilities it offers. (PASCO Capstone is pro-vided in the ME-8230 Materials Testing System.) Lab 02: Compliance Calibration Tutorial NOTE: A PASCO Capstone workbook file about compliance calibration is available to download from the PASCO web site. A measured current is applied to the Helmholtz coils so that the magnitude of the magnetic field within the electron tube can be calculated. The tube contains an electron gun, which generates a focused beam of electrons. How It WorksĪ large, helium-filled electron tube is mounted between a pair of Helmholtz coils. This apparatus also has deflection plates, so students can study the effect of an electric field on moving electrons. And, since the electron tube can be rotated through 90°, students can also make a more general study of the behavior of electrons in a magnetic field. The Charge-to-Mass Ratio System reproduces one version of Thomson’s landmark experiment, providing an accurate measurement of the charge-to-mass ratio of the electron. In the same year he measured the charge-to-mass ratio of the electron, providing the first measurement of one of the fundamental constants of the universe. will use and can be regarded as a user manual and general reference for later experiments. Thomson showed that the mysterious cathode rays were actually negatively charged particles-he had discovered the electron. The experiments are written in PASCO Capstone Workbooks, so teachers can easily modify them to fit their needs.

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