e/m Apparatus Manufacturer,Supplier and Exporter in India

e/m Apparatus

Product Code : ILS-EAM-11821

Indian Lab Suppliers supplies the e/m Apparatus (Product ID: 11821), part of the Electromagnetism and Motors range under Electricity and Magnetism. It measures the charge-to-mass ratio of the electron using Helmholtz coils.

Quick Answer

An electron gun fires a beam into a 13 cm tube between two Helmholtz coils (132 turns each, 15 cm radius and separation). The coils give a uniform field of 7.8 mT per amp, which bends the beam into a circle; from the beam radius, accelerating voltage and field you calculate e/m. The power supplies and two LED meters are built into the base, and a user manual is included.

Key Specifications

ParameterDetail
Tube diameter13 cm
Electron gunIndirectly heated cathode with accelerating anode
Helmholtz coils132 turns each; 15 cm radius; 15 cm separation
Magnetic field7.8 mT/A
Coil current0 to 3 A, regulated
Accelerating voltage100 to 500 V DC, adjustable
MetersTwo 3-digit LED panel meters
Size30 x 40 x 38 cm
IncludedUser manual

Where This Is Used

It is used in senior secondary and undergraduate modern physics labs. See more in Electromagnetism and Motors. Browse the full Electromagnetism and Motors range or the wider Electricity and Magnetism catalogue.

Frequently Asked Questions

What does it measure?
The charge-to-mass ratio (e/m) of the electron.

Are power supplies included?
Yes. They are built into the base.

What field do the coils give?
7.8 mT per amp, adjustable up to 3 A.

Related Categories

Electromagnetism and Motors · Electricity and Magnetism · Laboratory

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