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Unformatted text preview: 1 1 Midterm I Review Next time: HRW 26.1-26.5 2 Electric Charge Properties of electric charge: Conservation Quantization Atomic picture of matter: insulators conductors Charges are the sources of electric fields and potential Charged particles feel a force in an electric field 3 The effect of a point charge r r 2 qQ R F = 4 R R Q V = 4 R q + r F Q + + Q r r 2 Q R E = 4 R R + Q r r E = F q ; x E d =- V dx V =- W ; q 2 u = 2 E V=0 at R= 4 Electric force and potential energy r r f i =- ds E V r r F = E q x F d =- U dx x E d =- V dx r r f i =- ds F U U = V q r F U r E V V =- W q U =- W Electric field and potential Force Field Potential Energy Potential Work done by the field Work done by the field 2 5 Superposition r r r i i 2 i 0 i i q r E = 4 r r Its vector addition , so different components must be added separately. ( ) cos d d x x 2 q E = E = 4 r ( ) sin d d y y 2 q E = E = 4 r x y r E d For continuous charge distributions: Use symmetry to simplify things (before integrating).Use symmetry to simplify things (before integrating)....
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