Lecture03bd - Physics 102: Lecture 3 Electric Potential...

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Physics 102: Lecture 3, Slide 1 Physics 102: Lecture 3 Electric Potential Energy & Electric Potential
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Physics 102: Lecture 3, Slide 2 Overview for Today’s Lecture – Uniform fields – Point charges • Electric Potential (like height) – Uniform fields – Point charges
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Physics 102: Lecture 3, Slide 3 Work • Brick raised y i y f • Charge moved x i x f • F E = qE (left) • W E = –qEd • W you = qEd W = F d cos( q ) Gravity Electric F G =mg y i y f h • F G = mg (down) • W G = –mgh • W you = mgh - F x f x i E d W=0 W=0
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Physics 102: Lecture 3, Slide 4 A B C Uniform E In what direction does the force on a negative charge at point A point? 1) left 2) right 3) up CheckPoint 1.1 64% 35% 1% F Electric field points in the direction a POSITIVE charge would feel force.
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Physics 102: Lecture 3, Slide 5 A B C Uniform E When a negative charge is moved from A to C the ELECTRIC force does 1) positive work. 2) zero work. 3) negative work. 18% 76% 6% - F “I would say zero because the path is perpendicular to the field” motion CheckPoint 1.2
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Physics 102: Lecture 3, Slide 6 A B C Uniform E When a negative charge is moved from A to B the ELECTRIC force does 1) positive work. 2) zero work. 3) negative work. 49% 8% 43% CheckPoint 1.3 - F motion because the direction of the displacement is 180 degrees from direction of the force ΔU E = - W E field = +W You Electric force did negative work You did positive work Electric potential energy increased (Checkpoint 1.5)
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Physics 102: Lecture 3, Slide 7 A B C
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Lecture03bd - Physics 102: Lecture 3 Electric Potential...

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