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Lectures_Lect06

# Lectures_Lect06 - Physics 212 Lecture 6 Slide Physics 212...

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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 Electric Potential Electric Potential Physics 212 Lecture 6, Slide Physics 212 Lecture 6, Slide 2 BIG IDEA BIG IDEA • Last time we defined the electric potential energy of charge q in an electric field: 40 b b a b el a a U F dl qE dl ∆ = - = - r r r r • 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 U V E dl q ∆ ∆ = - r r • Note the similarity to the definition of another quantity which is also a PROPERTY OF THE SPACE , the electric field. q F E r ≡ V in Volts = Joules/Coulomb Physics 212 Lecture 6, Slide Physics 212 Lecture 6, Slide 3 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 • Remember the definition: ∫ ⋅- = ∆ → C A C A l d E V r r • Choose a path (any will do!) D ∆ x x ∫ ∫ ⋅- ⋅- = ∆ → C D D A C A l d E l d E V r r r r < ∆- = ⋅- = ∆ ∫ → x E l d E V C D C A r r Physics 212 Lecture 6, Slide Physics 212 Lecture 6, Slide 4 Checkpoint Checkpoint 2 2 08 A B C D • Remember the definition ∫ ⋅- = ∆ → B A B A l d E V r r = ∆ → B A V V is constant !!...
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Lectures_Lect06 - Physics 212 Lecture 6 Slide Physics 212...

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