K1-12. Cathode Ray Tube - Deflection By Magnet

Purpose

To demonstrate visually the force on an electron beam by a magnetic field.

Equipment

Cathode ray tube with power supply and weak bar magnet.

Images

Description

A cathode ray tube produces a beam of electrons which can be seen as it hits a phosphorescent surface inside the tube. Holding a magnet close to the CRT parallel to the table so that it produces a horizontal magnetic field inside the tube causes the electron beam to deflect up or down. The vector nature of the force can be studied by reversing the magnet.

References

Operating Instructions, Cathode Ray Tube, Model CR-100-A, Electro-Technic Products.