notes4 2317 - Electric Field ECE 2317 Applied Electricity...

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Prof. Filippo Capolino ECE Dept. Fall 2006 Notes 4 ECE 2317 ECE 2317 Applied Electricity and Magnetism Applied Electricity and Magnetism Notes prepared by the EM group, University of Houston . (used by Dr. Jackson, spring 2006) or Electric Field Electric Field ++ ++++ ++++ ++ -- ---- ---- -- + - V 0 E Fq E = 1 EF q The electric-field vector is the force vector for a unit charge. Units of electric field: [V/m] q Electric Field (cont.) Electric Field (cont.) 2 ˆ 4 q Er r π ⎛⎞ = ⎜⎟ ⎝⎠ Note: the electric-field vector may be non-uniform. E q point charge q in free space: Voltage Drop Voltage Drop E E = The voltage drop between two points is defined. C A B E ( x,y,z ) q = 1 [C] test charge F ext ( x,y,z ) The test charge is moved from point A to point B at a constant speed (no increase in kinetic energy). ext E FF q E =−
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Voltage Drop (cont.) Voltage Drop (cont.) W ext = work done by observer in moving the charge. BB B ext ext AA A W F dr qE dr q E dr =⋅ = = ∫∫ C A B E ( x,y,z ) q = 1 [C] test charge F ext ( x,y,z ) Voltage Drop (cont.) Voltage Drop (cont.) B ext A Wq E
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This note was uploaded on 10/25/2011 for the course ECE 2317 taught by Professor Staff during the Fall '08 term at University of Houston.

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notes4 2317 - Electric Field ECE 2317 Applied Electricity...

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