The potential difference between the accelerating plates of a TV set is about 25 kV. If the distance between the plates is 1.5 cm, fi nd the magnitude of the uniform electric fi eld in the region between the plates.
Lecture 15 2 How to produce B-field • Changing E-field • Electric currents • flowing electrons • nuclear and electron spins and orbital motion Magnetism in a materials ▪ Paramagnetic materials (amplify the external B-field) ▪ Diamagnetic (decrease the external B-field) ▪ Ferromagnetic (amplify, remain) ▪ Strongly interacting atoms & electrons ▪ Quantum & classical effects March 2, 2015 54 Magnetization • Electrons and ions have magnetic moments • No B-field: randomly oriented B Magnetization Paramagentic B Diamagnetic Magnetization Ferromagenic