SG_Chap16 - Chapter 16 Electric Energy and Capacitance 16.1...

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Chapter 16 Electric Energy and Capacitance 16.1 Potential difference and electric potential He is full of potential at this moment Potential to do a lot of damage Potential energy • Has to do with gravity (a force) • Has to do with height, or distance in the direction of the force Recall Work from PHY101 • Potential energy is always related to a force • In the presence of a force (gravity or electrical force), potential energy increases when an object is moved in the opposite direction of the force + + + + + + + + + + + + - - - - - - - - - - - - - - - - - + + A B + + + + + + + + + + + + + - - - - - - - - - - - - - - - - - - - A B - A B EPE A EPE B EPE A EPE B A B Quantitatively speaking PE = PE final -PE initial = E B -E A = F (x B -x A ) = -(mg)(x A ) = -mgh PE = - (F)(disp.) F parallel to disp. (x A -x B ) + + + + + + + + + + + + - - - - - - - - - - - - - - - - - + + A B EPE = EPE B -EPE A = -( F x) = -(Eq x) F parallel to x + + + + + + + + + + + + + - - - - - - - - - - - - - - - - - - - A B - EPE = EPE B -EPE A = -( F x) = -(-Eq x) F antiparallel to x Work and Potential Energy There is a uniform field between the two plates As the charge moves from A to B, work is done on it W = Fd=q E x (x f – x i ) ΔPE = - W = - q E x x – Only for a uniform field A positive charge loses electrical potential energy when it is moved in the direction of the electric field PE B -PE A = negative
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Energy and Charge Movements • A positive charge loses electrical potential energy when it is moved in the direction of the electric field • A negative charge loses electrical potential energy when it moves in the direction opposite the electric field • If a charge is released in the electric field, it
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This note was uploaded on 03/30/2009 for the course PHY 102 taught by Professor Luo during the Spring '08 term at SUNY Buffalo.

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SG_Chap16 - Chapter 16 Electric Energy and Capacitance 16.1...

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