The exercise oscilloscope is placed at the Helmholtz coils so that its main axis coincides with the axis of the coils. A sawtooth-shaped voltage is applied to the deflection plates of the oscilloscope so that a smooth horizontal line appears on the screen. Let direct current pass through the coils at a preset anode voltage and adjust the intensity of the current so that the line is focused at one point. The specific charge e/m of the electron can be calculated from the measured values ​​of the anode voltage and the current through the coil.

• Determination of the electron's specific charge according to Busch

A complete equipment for the experiment consists of:

765-0597 Exercise Oscilloscope

765-0820 Power supply, 0-500 V

765-1371 Rectifier cube, 25 V DC / AC, step controlled

765-0324 Digital Multimeter