Elec Potential - PHY 2049C General Physics B Fields Circuits Waves Light Today 1 Electric Potential from Multiple Sources Potential Energy Electric

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PHY 2049C – General Physics B Fields, Circuits, Waves, Light Today: 1) Electric Potential from Multiple Sources
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Potential Energy – Electric Potential The electric potential is defined as Potential Energy per unit charge . (Remember: The electric field is force per unit charge) Symbol: Potential = “Voltage” Unit: 1 Volt The field always points toward the lower Potential +V -V V = U q
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Potential around a point charge The following is the potential around a point charge The Potential is so far only defined over Potential differences We have to define “0 V” by convention: “very far away” is “zero potential” V = k q r V r positive charge, positive Potential 0 V r negative charge, negative Potential 0
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Potential of many Charges • The biggest advantage of using potentials is that potential is a “Voltage” in Volts (not a vector). • The potentials of many point sources add up like numbers ! • Remember; the fields due to many sources add up like vectors ! 3 12 4 1234 tot Q QQ Q VV V V V k k k k rr r r =+ ++ = + + + E 1 2 4 3 tot EE E E E GG G G G
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Question At which point is the electric potential = 0 ? (A) 1 (B) 2 (C) 3 (D) All of them
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Potential of a dipole
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Example: Zero Potential from two point charges Two charges are placed along the x-axis: +8.15 μ C at +3.05 cm, and -2.90
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This note was uploaded on 06/29/2010 for the course PHY2049C PHY2049C taught by Professor Duke during the Summer '10 term at FSU.

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Elec Potential - PHY 2049C General Physics B Fields Circuits Waves Light Today 1 Electric Potential from Multiple Sources Potential Energy Electric

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