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e/m BY THOMSON’s METHOD

Experiment(s):

1. Determination of e/m of an electron by Thomson’s method



Specifications:

a) Power supply
High tension and low tension
bias supply for CRT tube,
Variable deflection voltage for
x-shift and y-deflection beam movements
Meter: Digital voltmeter for
measuring deflection potential
Rated Input: 220 V/50 Hz
or 110 V/60 Hz

b) CRT tube
Diameter: 60 mm
Scale: x-axis and y-axis marked
in mm with zero adjustment &
position of deflecting plates marked

c) CRT/Compass stand
Material: Acrylic
Magnet guide bed: For
equi-distance movement up to
15 cm on either sides

d) Compass
Size: 100 mm diameter
Mirror for reduced parallax error

e) Bar magnet pair
Material: AlNiCo
Size: 50 mm

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