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4 cathode processes

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Mutual Inductance

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1. Electrons flow around a circular wire loop in a horizontal plane, in

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Chapter 4: Electric Potential

... Suppose conductors are brought into contact or connected by wires. In the electrostatic situation, the E field in the conductors will be zero, and therefore, all points in and on the conductors will be at the same potential. This idea allows us to find how the charge density, ρs , varies as a functi ...
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History of electromagnetic theory



For a chronological guide to this subject, see Timeline of electromagnetic theory.The history of electromagnetic theory begins with ancient measures to deal with atmospheric electricity, in particular lightning. People then had little understanding of electricity, and were unable to scientifically explain the phenomena. In the 19th century there was a unification of the history of electric theory with the history of magnetic theory. It became clear that electricity should be treated jointly with magnetism, because wherever electricity is in motion, magnetism is also present. Magnetism was not fully explained until the idea of magnetic induction was developed. Electricity was not fully explained until the idea of electric charge was developed.
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