PURPOSE: To demonstrate the force on an electron beam by a magnet field.
DESCRIPTION: A cathode ray tube is connected to a power supply. The cathode ray tube produces a beam of electrons which can be observed by the phosphorescence produced by the electrons hitting a phosphor surfaced screen inside the tube. Hold a magnet close to the CRT perpendicular to the tube so that the electron beam to deflects up and/or down. The vector nature of the force can be studied by reversing the magnet.
EQUIPMENT: Crooke's tube shown in the photo is stored in the modern physics cabinet. A solid state sparking power supply is stored in general use. The above photo shows the crooke's tube hooked up to the traditional reed sparker and the low voltage power supply that are still available in the general use cabinet.
Updated by Jun Qi in 3/13/2000