Cathode Ray Tube Experiment

J.J. Thomson's Cathode Ray Experiment

Balance the Electric and Magnetic fields to discover the electron.

Field Controls

Accelerating Voltage 3000 V

Higher voltage = faster, stiffer electron beam.

Electric Field (E) 0 V/m

Deflects the beam towards the positive plate.

Magnetic Field (B) 0 mT

Deflects the beam perpendicular to its travel.

The Goal: Deflect the beam using the Electric Field, then apply the Magnetic Field to bend it back perfectly to the center (Net Force = 0).

Electron Velocity (v) --

Net Vertical Force 0

Force Status BALANCED

Observation: Adjust the fields to begin the experiment.

Component Key

█ Cathode / Anode (Heater & Slit)
█ / █ Electric Deflection Plates
⭕ Magnetic Coils (Helmholtz)