Notes_for_Lecture-4_01-27-11

Notes_for_Lecture-4_01-27-11 - Lecture 4 Electric Potential...

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Lecture 4 Electric Potential
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New Concepts: • Electric potential • Electric potential energy • Potential due to a point charge • Potential due to a group of point charges – superposition • Potential due to an electric dipole Additional skills to learn: • Calculating the electric potential from the field • Calculating the field from the potential
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( ) Consider an electric charge moving from an initial position at point A to a final position at point B under the influenc f i x fi x o U U U W F x dx q Electric Potential Energy : e of a known electric field . The force exerted on the charge is: o ff o ii E F q E U F ds q E ds
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A B P P V E ds Electric Potential V Units of : J/C known as the "Volt" V
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Example: The electric field in a region of space has the components E y = E z = 0 and E x = (3.20 N/(C·m)) x . Point A is on the y axis at y = 4.40 m, and point B is on the x axis at x = 5.90 m. What is the potential difference (in V) V B V A ?
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O P 2 2 The potential at point P a distnce from O. cos The electric field gener ated by is: 4 4 R P RR o P o R P VR V E ds Edr Edr q q E r q dr V r q V Potential due to a point charge 11 44 R oo q rR
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Potential due to multiple charges: sum of potentials due to each charge.
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This note was uploaded on 02/07/2011 for the course PHY 21 taught by Professor Hickman during the Spring '08 term at Lehigh University .

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Notes_for_Lecture-4_01-27-11 - Lecture 4 Electric Potential...

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