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Your tests and the printouts with all your scores are in the folder with your name on the front desk. Inform me of any errors on the printout. Assignment for Monday: E2B.1, E2B.3, E2B.5, E2B.8 Next test after chapter E6. Relativity Test Results No. students 139 possible 1120-137 2110-119 4100-109 590-99 380-89 270-79 1Below 69 Relativity test results

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Chapter E2 Electric Fields

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Fields Instead of considering the interaction to be direct from charge to charge it is often convenient to consider fields: charge field charge In place of charge charge

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Defination of Electric Field Therefore the electric force on any particle is given by the product of the field and the charge: Units of E are? Newtons/Coulomb

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Vector Definitions x y z C P

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The field at point P due to a point charge at point C. x y z C P where

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Visualization of electric fields See pictures on page 28 On your paper, draw the field in the region of space around the dipole below. Raise your hand when finished. +- Think about how a positive particle would move. Lines can never cross each other.

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The electric field lines show the direction of the electric field. They show the path a positively charged particle would take. Electric field lines never cross one another. Draw on a sheet of paper the lines around a negative point charge. Draw on a sheet of paper the lines around two positive charges separated by a distance “d”.

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Visualization of electric fields On your paper, draw the field in the region of space around the three equal charges below. + + -

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Fields from distributions of charges. Very long lines of charge (+ and -) Rings of charge Planes of charge

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Assignment for Monday E2B.1, E2B.3, E2B.5, E2B.8

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