Charge, Induction, Conducters vs Insulators
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The elementary charge , usually denoted as e , is the electric charge carried by a single proton , or equivalently, the negation (opposite) of the electric charge carried by a single electron . [ 2 ] This elementary charge is a fundamental physical constant . To avoid confusion over its sign, e is sometimes called the elementary positive charge . This charge has a measured value of approximately 1.602 1 76 5 65(35) × 10 −19 coulombs . [ 1 ] In the cgs system, e is 4.803 2 04 2 5(10) × 10 −10 statcoulombs . [ 3 ]
In a conductor, electric current can flow freely, in an insulator it cannot.
Electromagnetic induction is the production of a potential difference (voltage) across a conductor when it is exposed to a varying magnetic field .