5 electricPotential(1)

5 electricPotential(1) - Craig Ogilvie Craig Ogilvie 11...

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Unformatted text preview: Craig Ogilvie Craig Ogilvie 11 Review Lecture 4 E-field is the vector sum of E-fields from all charges Continuous charge distribution => integral Fascinating when charges are mobile Forces, due to E-field, move charges Total E-field is now different, because charges have moved Process continues till net force on charges are zero Shapes, functions of molecules, proteins For example, conductors in an E-field Charges move to surface E-field: sum of E-field from surface charges+external E-field E=0 inside conductor Craig Ogilvie Goals Electrical phenomena from an energy perspective Electric potential energy Electric potential Craig Ogilvie 22 Craig Ogilvie Question: Work 1st round Craig Ogilvie 33 When a positive charge is moved opposite to the direction of the electric field 1. the field does positive work on it and the potential energy increases. 2. the field does positive work on it and the potential energy decreases. 3. the field does negative work on it and the potential energy increases. 4. the field does negative work on it and the potential energy decreases. + q O bj1 0 O bj1 0 1 0 of 30 Craig Ogilvie Question: Work 2nd round Craig Ogilvie 44 1 2 3 4 0% 0% 0% 0% When a positive charge is moved opposite to the direction of the electric field 1. the field does positive work on it and the potential energy increases.and the potential energy increases....
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5 electricPotential(1) - Craig Ogilvie Craig Ogilvie 11...

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