Thomson Tube Experiment 115V

The Thomson Tube for Determination of e/m is designed to investigate the behavior of electron beams in electric and magnetic fields and to determine the specific charge (e/m) of an electron. The apparatus demonstrates thermionic emission, electron beam deflection, and velocity analysis using electric and magnetic fields. A focused electron beam is produced inside an evacuated glass tube and projected onto a fluorescent screen for clear observation, making it an ideal experimental setup for advanced physics laboratories. Manufactured by Atico Export India.

Principle

The Thomson Tube is used to investigate the deflection of electron beams in electric and magnetic fields. It enables the estimation of the specific charge (e/m) of an electron and the determination of electron velocity. The tube consists of an electron gun that produces a narrow, focused electron beam inside an evacuated glass bulb. The electron beam can be deflected electrostatically using built-in deflection plates or magnetically using Helmholtz coils. The beam strikes a fluorescent screen mounted on a mica sheet with a millimeter graticule, allowing accurate observation and measurement of electron deflection.

Objectives

• Study the thermionic emission of electrons.
• Observe the deflection of electrons in electric and magnetic fields.
• Estimate the specific charge (e/m) of an electron.
• Investigate the behavior of electron beams under electric and magnetic fields.
• Construct a velocity filter using mutually perpendicular electric and magnetic fields.
• Determine the velocity of electrons experimentally.

System Composition

Thomson Tube :

• 1 Pc

Tube Holder :

• 1 Pc

High Voltage DC Power Supply :

• 1 Pc

DC Power Supply :

• 1 Pc

Helmholtz Coils :

• 1 Pair

Accessories

Connecting Leads :

• Not Included

Focused Electron Gun :

• Produces a narrow and well-defined electron beam.

Electrostatic Deflection :

• Built-in deflection plates generate an electric field for beam deflection.

Magnetic Deflection :

• Compatible with Helmholtz coils for studying magnetic field effects.

Fluorescent Screen :

• Bright fluorescent screen enables clear observation of the electron beam.

Millimeter Graticule :

• Printed measurement scale allows accurate tracking of the electron beam path.

Evacuated Glass Tube :

• Provides a controlled environment for stable electron beam generation.

Compact Experimental Setup :

• Designed for convenient operation and accurate laboratory measurements.