13_e_over_m

13_e_over_m - INDIANA UNIVERSITY, DEPARTMENT OF PHYSICS,...

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INDIANA UNIVERSITY, DEPARTMENT OF PHYSICS, P309 LABORATORY Laboratory #13: Charge-to-Mass Ratio for the Electron Goal: Measure the ratio between the charge of the electron and its mass. Equipment: Electron tube with Helmholtz coils (CENCO 71267), Variac, 1kW, with switch (for filament), 110V/6.3V transformer (little, black, Pasco), Ampere meter 0-1A AC (mechanical), power supply, DC 20V (for B field), 8A (Pasco SF9584), Ampere meter 0- 10V DC (mechanical), Kepco power supply, DC 1kV, 20mA (for plate and grid), power supply, DC 60V, 1.5A (Atomic Laboratories), DMM. (A) The physics Electrons as discrete particles have been discovered and extensively studied by J.J. Thomson (1856-1940). By investigating the curvature of trajectories in magnetic fields a value for e/m can be obtained. The currently accepted value is e/m = 1.75890 10 11 C/kg. The kinetic energy of an electron that has been accelerated by a potential difference V acc is given by V acc e = mv 2 /2 . The force F on a charge e moving with velocity
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13_e_over_m - INDIANA UNIVERSITY, DEPARTMENT OF PHYSICS,...

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