Objective: Demonstrate the superposition of magnetic fields in a vacuum
The absence of interference when magnetic fields are superposed in a vacuum is demonstrated using a
Braun tube. This is done by observing the displacements of the focused spot on the fluorescent screen
of the tube. The experiments can be extended to include alternating magnetic fields with identical and
different frequencies. The Lissajous’ figures observed on the screen depend critically on the relation
between the frequencies of the two magnetic fields and on their phase relation.
![Experiment: Training Oscilloscope II (230 V, 50/60 Hz), 8000672 [UE3070850-230], Experiments with Electron Tubes](/imagelibrary/UE3070850-230/UE3070850-230_01_Experiment-Training-Oscilloscope-II-230-V-5060-Hz.jpg)
![Experiment: Training Oscilloscope II (230 V, 50/60 Hz), 8000672 [UE3070850-230], Experiments with Electron Tubes](/thumblibrary/UE3070850-230/UE3070850-230_01_1200_1200_Experiment-Training-Oscilloscope-II-230-V-5060-Hz.jpg)
![Set of 15 Safety Experiment Leads, 75 cm, 1002843 [U138021], Circuits](/thumblibrary/U138021/U138021_01_140_140_Set-of-15-Safety-Experiment-Leads-75-cm.jpg)
![DC Power Supply 0-500 V (230 V, 50/60 Hz), 1003308 [U33000-230], Power Supplies](/thumblibrary/U33000-230/U33000-230_01_140_140_DC-Power-Supply-0-500-V-230-V-5060-Hz.jpg)
![Function Generator FG 100 (230 V, 50/60 Hz), 1009957 [U8533600-230], Function Generators](/thumblibrary/U8533600-230/U8533600-230_01_140_140_Function-Generator-FG-100-230-V-5060-Hz.jpg)
![Training Oscilloscope, 1000902 [U8481350], Electron Tubes D](/thumblibrary/U8481350/U8481350_01_140_140_Training-Oscilloscope.jpg)
![AC/DC Power Supply (Stabilized) 0-12 V, 3 A (230 V, 50/60 Hz), 1001007 [U8521105-230], Power Supplies](/thumblibrary/U8521105-230/U8521105-230_01_140_140_ACDC-Power-Supply-Stabilized-0-12-V-3-A-230-V-5060-Hz.jpg)
![Pocket Measuring Tape, 2 m, 1002603 [U10073], Accessory - Measurement of Length](/thumblibrary/U10073/U10073_01_140_140_Pocket-Measuring-Tape-2-m.jpg)
![Projectile Launcher, 1002654 [U10360], Oblique throw](/thumblibrary/U10360/U10360_01_140_140_Projectile-Launcher.jpg)
![Clamp for Projectile Launcher, 1002655 [U10361], Oblique throw](/thumblibrary/U10361/U10361_01_140_140_Clamp-for-Projectile-Launcher.jpg)
![PC Oscilloscope 2x25 MHz, 1020857 [U11830], Oscilloscopes](/thumblibrary/U11830/U11830_01_140_140_PC-Oscilloscope-2x25-MHz.jpg)
![Barrel Foot, 1 kg, 1002834 [U13265], Bases](/thumblibrary/U13265/U13265_01_140_140_Barrel-Foot-1-kg.jpg)
![Vertical Ruler, 1 m, 1000743 [U8401560], Accessory - Measurement of Length](/thumblibrary/U8401560/U8401560_01_140_140_Vertical-Ruler-1-m.jpg)
![Set of Riders for Rulers, 1006494 [U8401570], Accessory - Measurement of Length](/thumblibrary/U8401570/U8401570_01_140_140_Set-of-Riders-for-Rulers.jpg)
![Basic Experiment Board (230 V, 50/60 Hz), 1000573 [U11380-230], Plug-In Component System](/thumblibrary/U11380-230/U11380-230_01_140_140_Basic-Experiment-Board-230-V-5060-Hz.jpg)
![Pair of Safety Experiment Leads, 75 cm, blue, red, 1017718 [U13816], Experiment Leads and Cables](/thumblibrary/U13816/U13816_01_140_140_Pair-of-Safety-Experiment-Leads-75-cm-blue-red.jpg)
![Set of Helical Springs for Hooke‘s Law, 1003376 [U40816], Coil Springs](/thumblibrary/U40816/U40816_01_140_140_Set-of-Helical-Springs-for-Hooke-s-Law.jpg)
![Accessories for Spring Oscillations, 1000703 [U56003], Mechanical Waves](/thumblibrary/U56003/U56003_01_140_140_Accessories-for-Spring-Oscillations.jpg)
![Kater’s Reversible Pendulum, 1018466 [U8557170], Oscillations](/thumblibrary/U8557170/U8557170_01_140_140_Kater-s-Reversible-Pendulum.jpg)
![Analogue Multimeter ESCOLA 100, 1013527 [U8557380], Hand-held Analog Measuring Instruments](/thumblibrary/U8557380/U8557380_01_140_140_Analogue-Multimeter-ESCOLA-100.jpg)
![Experiment: Inclined Launch, 8000533 [UE1030400], Translational motions](/thumblibrary/UE1030400/UE1030400_01_140_140_Experiment-Inclined-Launch.jpg)
![Experiment: Fine-Beam Tube (230 V, 50/60 Hz), 8000668 [UE3070700-230], Experiments with Electron Tubes](/thumblibrary/UE3070700-230/UE3070700-230_01_140_140_Experiment-Fine-Beam-Tube-230-V-5060-Hz.jpg)