Electric Charge o Two kinds of electric charge: positive and negative o Like charges repel; opposite charges attract o Force is stronger when charges are close o “neutral” matter is made of + and – charges! o Friction can separate these charges o Charge is free to move around in a conductor, its stuck in place on an insulator o Unit of charge is the coulomb [C] o Charge of electron (negative) or proton (positive) is o ±𝑒, 𝑒 = 1.602 ∗ 10−19 𝐶 o Charge is quantized and conserved (can’t be created/destroyed) o 𝑄 = ±𝑁𝑒 o Neutral matter is made of + and – charges in equal numbers. We say it has no net charge Vectors o A quantity that is fully described by a single number is called a scalar quantity (i.e., mass, temperature, volume) o A quantity having both a magnitude and a direction is called a vector quantity o The geometric representation of a vector is an arrow with the tail of the arrow placed at the point where the measurement is made o We label vectors by drawing a small arrow over the letter that represents the vector

Electric Charge Tutorial Notes

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