# Lect06 - Physics 212 Lecture 6 Slide Physics 212 Lecture 6...

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Unformatted text preview: Physics 212 Lecture 6, Slide Physics 212 Lecture 6, Slide 1 Physics 212 Physics 212 Lecture 6 Lecture 6 Today's Concept: Today's Concept: Electric Potential Electric Potential Defined in terms of Path Integral of Electric Field Defined in terms of Path Integral of Electric Field 10 20 30 40 50 60 Avg = 3.0 Avg = 3.0 Confused Confused Confident Confident Physics 212 Lecture 6, Slide Physics 212 Lecture 6, Slide 2 Music Who is the Artist? Who is the Artist? A) A) Eric Clapton Eric Clapton B) B) Bill Frisell Bill Frisell C) C) Sonny Landreth Sonny Landreth D) D) Pat Metheny Pat Metheny E) E) Jeff Beck Jeff Beck Why?? Why?? I think he is my favorite jazz guitarist I think he is my favorite jazz guitarist He is playing Saturday afternoon at Krannert! He is playing Saturday afternoon at Krannert! PS Pat Metheny and Sonny Landreth have PS Pat Metheny and Sonny Landreth have played at past Krannert guitar festivals played at past Krannert guitar festivals Physics 212 Lecture 6, Slide Physics 212 Lecture 6, Slide 3 BIG IDEA BIG IDEA • Last time we defined the electric potential energy of charge q in an electric field: 40 ∫ ∫ ⋅- = ⋅- = ∆ → b a b a b a l d E q l d F U • The only mention of the particle was through its charge q . • We can obtain a new quantity, the electric potential, which is a property of the space, as the potential energy per unit charge. ∫ ⋅- = ∆ ≡ ∆ → → b a b a b a l d E q U V • Note the similarity to the definition of another quantity which is also a property of the space, the electric field. q F E l ≡ Physics 212 Lecture 6, Slide Physics 212 Lecture 6, Slide 4 Electric Potential from E field Electric Potential from E field • Consider the three points A, B, and C located in a region of constant electric field as shown. 40 • What is the sign of ∆ V AC = V C- V A ? (A) ∆ V AC < 0 (B) ∆ V AC = 0 (C) ∆ V AC > 0 BB BB • Remember the definition ∫ ⋅- = ∆ → C A C A l d E V • Choose a path (any will do!) D ∆ x ∫ ∫ ⋅- ⋅- = ∆ → C D D A C A l d E l d E V < ∆- = ⋅- = ∆ ∫ → x E l d E V C D C A Physics 212 Lecture 6, Slide Physics 212 Lecture 6, Slide 5 Preflight Preflight 6 6 08 A B C...
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Lect06 - Physics 212 Lecture 6 Slide Physics 212 Lecture 6...

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