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PIRA Code(s)
Set up time
2 minutes
Physics and Science Concepts
Magnetic Fields and Forces
Plug in the cathode ray tube. Deflect the beam of the CRT by holding a permanent magnet near the edge of the tube. If the beam disappears, you are holding the magnet too close. Also, you can deflect the beam by attaching a battery to the binding posts and adjusting the variable control knob.

A bar magnet can deflect the electron beam in a cathode ray tube (CRT) according to the right-hand rule. This is due to the force a magnetic field has on a moving charge.