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P219lecture01electricfield

# P219lecture01electricfield - Goal To understand what...

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Goal: To understand what Electric Fields are and how to calculate them. Objectives: 1) Understanding what charges are. 2) Knowing how to produce a charge. 3) How to calculate an electric field from a collection of charges

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What is charge? For the most part, charge is a measure of how many protons or electrons you have somewhere. Charge is measured in units of Coulombs (C). An elementary charge from a proton or electron has magnitude of 1.602 * 10 -19 C. Like charges repel. Opposite attract. Charges can move.
How do you get charge? 1) Rubbing (static electricity) 2) Induction (charge obtained from a changing magnetic field) 3) Conduction (moving charge along a wire)

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Electric Field Suppose you wanted to know where the water would flow when it rains. How would you do that?
Fields Fields are just a listing of possible potential at any given point. For rain you look at the Gravitational Field – which is just a fancy way of saying the topography. Water will want to flow downwards.

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