Specific Charge Experiment

 

Specific Charge Experiment

JJ Thomson identified the electron by measuring its response to both electric and magnetic fields. Simlutaion allows you to see how a cathode ray behaves in these different fields. If you balance the forces on the beam you can work out the specific charge of the electron.

Find the velocity the cathode rays by balancing the electric and the magnetic field. When the deflection angle is zero, the two fields are of equal strength, and the cathode rays' velocity can be found. Use the sliders to change the field strengths.

What value did you find? You may be able to increase your accuracy by increasing the field strengths and causing a greater deflection.

Back to Cambridge Physics index