L2_30Mar_posted

L2_30Mar_posted - Physics 6C: Charge Distributions and...

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1 Physics 6C: Charge Distributions and Electric Fields
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2 Housekeeping Mastering Physics for homework assignments course ID is: MPDEWEY6CS11 Homeworks will be due Mondays at 8pm » HW1 due 4/4 Class website on eCommons Physics 6C (61668) Possible change of midterm dates… Weds, April 20 instead of Fri, April 22 Weds, May 11 instead of Fri, May 13 will do clicker poll on Friday
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3 Coulombs Law
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4 Monday’s example: An electron in a hydrogen atom is about 50 picometers (50 x 10 -12 m) from the proton in the nucleus. What force does the proton exert on it? F 12
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5 More complicated example: superposition Two protons and an electron are placed as shown on the corners of an equilateral triangle with sides of 50pm. What is the net force on the electron? p p e 50pm
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6 Math brush-up: Adding vectors Conceptually: place vectors head to tail Practically: add component by component v 3x = v 1x + v 2x v 3y = v 1y + v 2y v 1 v 3 v 2
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7 Math brush-up: Vector components 2-D 3-D: The concepts are similar, the trig is more complicated θ
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L2_30Mar_posted - Physics 6C: Charge Distributions and...

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